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Effect of stable stacking fault energy and crystal orientation on fracture behaviour of thin metallic single crystals Philos. Mag. (IF 1.778) Pub Date : 2021-01-17 Rajwinder Singh; Dhiraj K. Mahajan
ABSTRACT Understanding the evolution of dislocations and twinning at the crack front is critical for designing micro-mechanical systems with improved performance. In this work, the dislocation evolution at the crack front in thin pre-cracked FCC single crystals is correlated with the associated fracture toughness, which is shown to be dependent on material specific properties such as stable stacking
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{101̄2} twinning in single-crystal titanium under shock loading Philos. Mag. (IF 1.778) Pub Date : 2021-01-17 Sunil Rawat; Nilanjan Mitra
ABSTRACT We employ molecular dynamics simulations to investigate the evolution dynamics of { 10 1 ¯ 2 } twinning in single-crystal Ti under shock loading. The shock compression applied perpendicular to the c-axis leads to the activation of { 10 1 ¯ 2 } twins in single-crystal Ti. We find the twin variant activation for each case of the applied loading conditions follows Schmid criterion. However, the
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Analysis of the initial oxidation layer of W-substituted alumina-forming heat-resistant steel Philos. Mag. (IF 1.778) Pub Date : 2021-01-17 Heon-Young Ha; Tae-Ho Lee; Sung-Dae Kim; Jun-Yun Kang; Jae Hoon Jang; Joonoh Moon; Min-Ho Jang; Hyun-Uk Hong
ABSTRACT High-temperature oxidation behaviour of an alumina-forming austenitic (AFA, Febalance–20Ni–14Cr–2.5Al–0.15Si–2Mn–2.5Mo–0.9Nb, in wt%) steel and W-substituted AFA steel was examined. The isothermal oxidation tests were performed on the two steels at 780°C for 2 weeks in air, which indicated that the substitution of W for Mo was beneficial to improve the oxidation resistance of the AFA steel
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Robust half-metallicity in CoZrMnZ (Z = P, As and Sb) quaternary Heusler alloys Philos. Mag. (IF 1.778) Pub Date : 2021-01-17 C. Abbes; S. Belbachir; H. Abbassa; S. Meskine; A. Boukra; A. Boukortt
ABSTRACT The spin-polarized full-potential linearized augmented plane wave (FP-LAPW) method based on the density functional theory (DFT) and the exchange and correlation potential is treated with the generalized gradient approximation (GGA) and the Coulomb repulsion (GGA + U), as well as the modified Becke-Johnson approach (GGA-mBJ) are investigated on the structural, elastic, electronic and magnetic
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Some thermodynamical peculiarities at the Lifshitz topological transitions in trigonally warped AB-stacked bilayer graphene and graphite near K points Philos. Mag. (IF 1.778) Pub Date : 2021-01-17 V. N. Davydov
ABSTRACT Similarity has been proven between the Lifshitz topological transitions (LTT) in AB-stacked trigonally warped bilayer graphene (TWBG) and graphite near K points. The density of states (DOS) has been shown to have the van Hove singularities (VHS) of type ( ϵ c − | ϵ | ) − 1 / 2 at LTT in AB-stacked (TWBG) and graphite near K points. The topology evolutions of the iso-energetic lines at LTT
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Weathering induced morphological modification on the thermal diffusivity of natural pyrrhotite: a thermal lens study Philos. Mag. (IF 1.778) Pub Date : 2021-01-17 M. S. Swapna; V. Gokul; Vimal Raj; R. Manu Raj; S. N. Kumar; S. Sankararaman
ABSTRACT Natural pyrrhotites have gained significant attention due to their interesting electronic, antimicrobial, and chemical properties. The present work attempts to explore the morphology-induced modifications in the thermal characteristics of natural pyrrhotite due to ageing. The morphological, elemental, structure, optical, and thermal characterisations help in understanding the effect of ageing
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Spin and charge localisation due to the interplay of Ac gate voltage and spin–orbit interaction Philos. Mag. (IF 1.778) Pub Date : 2021-01-06 K. Rahim; U. Hasan
ABSTRACT We investigate the effects of a time-dependent gate voltage on a spin–orbit interaction (SOI) coupled interacting double quantum dot (DQD) system. For a tunnel coupled detuned DQD with two interacting electrons, SOI couples triplet T 0 and hybridised singlet state (1,1)–(0,2) through spin nonconserving transition. In order to explore the effects of Ac gate voltage on charge localisation, we
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The response of boronized 34CrAlMo5-10 (EN41B) steel to nanoindentation, oxidation, and wear Philos. Mag. (IF 1.778) Pub Date : 2020-12-30 Aditya K. Litoria; Manoj D. Joshi; V. Antunes; Digvijay Singh; Carlos A. Figueroa; F. Alvarez; Santosh S. Hosmani
ABSTRACT The present study deals with the properties of boronized and non-boronized low-alloy steel (34CrAlMo5-10). Specimens are characterised using microscopy, various spectroscopic techniques, nanoindentation, surface profilometer, and tribometer. The boronized region contains (i) (Fe, M)2B columns and (ii) matrix between the columns. Nanoindentation study reveals the difference in the mechanical
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On the electrical conductivity of metals with a rough surface Philos. Mag. (IF 1.778) Pub Date : 2020-12-27 Hai-Yao Deng
ABSTRACT We discuss surface roughness effects on the conduction of electrons in metals using both the quantal Kubo–Greenwood formalism and the semi-classical Fuchs–Sondheimer method. The main purpose here is to compare these methods and clarify a few subtle and widely misunderstood conceptual issues. One of such issues is concerned with the conditions under which the broken translation symmetry along
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Effect of temperature on the evolution dynamics of voids in dynamic fracture of single crystal iron: a molecular dynamics study Philos. Mag. (IF 1.778) Pub Date : 2020-12-27 Sunil Rawat; Shashank Chaturvedi
ABSTRACT We employ molecular dynamics simulations to investigate the role of temperature on the evolution dynamics of the voids in single crystal iron. We simulate isotropic tension in single crystal iron at a constant strain rate with temperature in the range of 300–1200 K. We find that the number of voids is highest at 1200 K in comparison to that at 300 K indicating high nucleation events at high
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Study the influence of oxygen-deficient (δ = 0.135) in SrFeO3-δ nanoparticles perovskite on structural, electrical and magnetic properties Philos. Mag. (IF 1.778) Pub Date : 2020-12-27 A. Abd El-Naser; E. K. Abdel-Khalek; E. Nabhan; D.A. Rayan; M. S. Gaafar; N. S. Abd El-Aal
ABSTRACT In this report, SrFeO3-δ nanoparticle perovskite sample was prepared by the co-precipitation method. Rietveld refinement of the X-ray diffraction (XRD) data of SrFeO3-δ sample showed that it has a cubic phase (space group: Pm3 m). The morphology and average size (11.15 nm) of the SrFeO3-δ nanoparticle samples were characterised by the high-resolution transmission electron microscope (HRTEM)
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Influences of growth rate on microstructures and magnetostrictive properties of Fe83Ga17 directional solidification alloys Philos. Mag. (IF 1.778) Pub Date : 2020-12-27 Xuan Zhao; Xiao Tian; Zhanquan Yao; Lijuan Zhao; Rui Wang; Hongbo Hao
ABSTRACT In this paper, the influence of growth rates on the microstructure and magnetostrictive properties of Fe83Ga17 directional solidification alloys were investigated. The microstructure and magnetic properties of Fe83Ga17 as-cast and directional solidification samples were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), optical
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Electronic and optical properties of an electro-magnetic non-uniform narrow quantum ring under repulsive scattering centre Philos. Mag. (IF 1.778) Pub Date : 2020-12-27 J. D. Salazar-Santa; M. E. Mora-Ramos; J. H. Marín
ABSTRACT Non-uniform height semiconductor quantum rings are studied in order to determine their electronic and optical absorption properties. Theoretical modelling of the structure includes an analytical description of the non-regular multi-hilled confining potential as well as the presence of repulsive scattering centre and external crossing electric and magnetic fields. We have discussed the features
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Stark shift and exciton binding energy in parabolic quantum dots: hydrostatic pressure, temperature, and electric field effects Philos. Mag. (IF 1.778) Pub Date : 2020-12-25 O. Mommadi; A. El Moussaouy; M. El Hadi; M. Chnafi; Y. M. Meziani; C. A. Duque
ABSTRACT The temperature, hydrostatic pressure, and external electric field effects on the confined exciton in cylindrical quantum dots by considering a parabolic confining potential are investigated. The effects of these external perturbations on the binding energy and interband emission energy are calculated numerically by adopting the variational method within the effective mass approximation. Our
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Intensity characterisation of polarisation vortex formation and evolution in ferroelectric nanofilms Philos. Mag. (IF 1.778) Pub Date : 2020-12-09 Wenkai Jiang; Xinhua Yang; Di Peng
ABSTRACT As a class of typical topological structures, polarisation vortexes were characterised by the intensity vector which is defined as the curl of the polarisation at their cores. Some phase field simulations were conducted on the lead titanate nanofilms to evaluate the effects of model size, temperature, traction, and curled electric field on the formation and evolution of polarisation vortex
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Finite-temperature first-principles calculations of Al 〈100〉 symmetric tilt grain-boundary energy Philos. Mag. (IF 1.778) Pub Date : 2020-12-07 S. R. Nishitani
ABSTRACT The energies of small-angle tilt grain-boundaries have been predicted using the Read–Shockley model based on dislocation theory. However, experimentally observed energies have been inconsistent with the Burgers vector-dependent values derived from this theory. Finite-temperature predictions of grain-boundary energies, performed via first-principles calculations, show consistency with the experimental
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On friction stir welding of a medium manganese austenitic steel Philos. Mag. (IF 1.778) Pub Date : 2020-12-03 Vladimir Torganchuk; Igor Vysotskiy; Sergey Malopheyev; Andrey Belyakov; Rustam Kaibyshev
ABSTRACT The plates of an Fe–12%Mn–0.5%C–1.5%Al austenitic steel with an original grain size of 80 µm were subjected to friction stir welding using a spherical welding pin. The fine grained microstructures with a grain size being dependent on the welding feed speed were evolved in the stir zones. The microstructure evolution in the stir zone resulted from a kind of post-dynamic recrystallisation. An
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A novel approach of high-voltage low-current electric energy input to synthesise cost-effective ultra-strong ductile material Philos. Mag. (IF 1.778) Pub Date : 2020-12-03 Mousumi Mallick; Swapan Kumar Mitra; Debasish Basak; Nirmal Kumar Roy; Joydeep Maity
ABSTRACT Adopting a unique electrical circuit design, here we treat a significant low-cost engineering material (eutectoid steel not containing costly alloying elements) with a high-voltage (100 kV) low-current (150 mA) energy input (energy level exceeding cohesive energy). A distinctive structural evolution is ascertained with treatment duration of only 5 min as an outcome of lamellar fragmentation
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Dynamics of smectic-C liquid crystals in a stochastic magnetic field Philos. Mag. (IF 1.778) Pub Date : 2020-11-25 Prabir K. Mukherjee
ABSTRACT The dynamical evolution of smectic-C liquid crystals in the presence of a magnetic field is studied. The theoretical analysis is based on dynamic renormalisation group techniques. The starting point of the analysis is the nonlinear elastic model of smectic-C liquid crystals followed by Langevin formulation. The dynamical model predicts the onset of Kosterlitz-Thouless transition at low frequency
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Impact of germanium doping on the mechanical strength of low oxygen concentration Czochralski silicon wafers Philos. Mag. (IF 1.778) Pub Date : 2020-11-25 Junnan Wu; Robert W. Standley; Katharine M. Flores
ABSTRACT The lack of interstitial oxygen for locking and pinning of dislocations has made the ultra-high resistivity silicon wafers for radio frequency applications prone to slip and warpage during electronic device manufacturing. In this work, we investigate the role of germanium doping on the dislocation mobility in very low oxygen concentration, Czochralski-grown silicon wafers. Mechanical bending
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Displacement field due to glide and climb of rectilinear dislocations in gradient elasticity Philos. Mag. (IF 1.778) Pub Date : 2020-11-25 Kamyar M. Davoudi
ABSTRACT The aim of this article is to provide the displacement field of a straight dislocation in gradient elasticity that can be implemented in dislocation dynamics simulations. The displacement and plastic strain fields of a dislocation depend on the history of the dislocation motion. The cut surface (or the branch cut) represents this history. When an edge dislocation glides, the branch cut must
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Thermodynamic phase diagram and thermoelectric properties of LiMgZ (Z = P, As, Bi): ab initio method study Philos. Mag. (IF 1.778) Pub Date : 2020-11-20 Sajad Parsamehr; Arash Boochani; Maliheh Amiri; Shahram Solaymani; Elmira Sartipi; Sirvan Naderi; Amin Aminian
ABSTRACT Using first principle calculations based on the density functional theory (DFT), the structural, elastic, electronic, and thermoelectric properties, and thermodynamic stability of the LiMgZ (Z = P, As, Bi) half-Heusler ternary compounds were studied. The results of structural calculations and elastic constants and investigation of the thermodynamic phase diagram represent stability for these
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TGS crystal as a maximum temperature thermometer Philos. Mag. (IF 1.778) Pub Date : 2020-11-20 Bogusław Fugiel; Toshio Kikuta
ABSTRACT Memory effects generated by a prolonged transverse electric field in the triglycine sulphate (TGS) ferroelectric were investigated quantitatively. Four characteristic temperatures were introduced, TS ≤ TA ≤ TH < TC, where TC is a para-ferroelectric critical temperature. Measurements of depolarizing transverse electric current carried out in heating from TS (or TA) up to above TC were preceded
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Evolution of microstructural deformation mechanisms under equal-channel angular extrusion loading conditions: a molecular dynamics case study of single crystal titanium Philos. Mag. (IF 1.778) Pub Date : 2020-11-20 Sunil Rawat; Nilanjan Mitra
ABSTRACT Classical molecular dynamics simulations have been performed to investigate the microstructural evolution of single crystal titanium under equal channel angular extrusion process (ECAE). The ECAE loading condition has been simulated by constraining deformation along two directions and applying shear along one direction. We find that for the case where shear is applied along < 2 1 ¯ 1 ¯ 0 >
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Phenomenological approach of the thermodynamic properties of the charge density wave systems Philos. Mag. (IF 1.778) Pub Date : 2020-11-20 M. Saint-Paul; P. Monceau
ABSTRACT The properties of the specific heat and elastic stiffness components at the charge density wave phase transition in several one-dimensional and two-dimensional materials are examined. Here we show that the thermodynamic properties of the rare earth tritelluride R Te 3 ( R = Te , Er) and Lu 5 Ir 4 Si 10 compounds can be explained in the framework of a standard mean field Landau theory. The
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The effects of elastic cycling in nanoindentation of a metallic glass Philos. Mag. (IF 1.778) Pub Date : 2020-09-15 C. M. Meylan; A. L. Greer
ABSTRACT We use nanoindentation to perform elastic cycling on, and to characterise, the bulk metallic glass Cu46Zr46Al7Gd1. From multiple loading curves, cumulative distributions are determined for several properties, including the initial yield load, the hardness and the indentation modulus. The distributions are characterised by the median property value and by their width. The effects of elastic
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Structural and electronic properties of non-metal doping in Li2FePO4F compound: spin density functional theory Philos. Mag. (IF 1.778) Pub Date : 2020-09-15 Worasak Sukkabot
ABSTRACT I comparatively determine the structural and electronic properties of Li2FePO4F compounds with F substituted by Cl, Br and I atom using the spin density functional theory with Perdew–Burke–Ernzerhof generalised gradient approximation (GGA + U). The lattice parameters and volumes are improved by the dopants because of the greater atomic radius in dopants. Non-metal doping in Li2FePO4F reduces
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Bridge constant and atom between theoretical and experimental magnetism in Ni2MnSb Heusler alloy: DFT and EFT studies Philos. Mag. (IF 1.778) Pub Date : 2020-11-16 Buket Saatçi; Numan Şarlı; Evren Görkem Özdemir; Ziya Merdan
ABSTRACT Ni2MnSb Heusler alloy is modelled and its magnetic properties are investigated by means of the effective field theory (EFT) developed by Kaneyoshi. Furthermore, the structural and electronic properties are performed by using density functional theory (DFT). According to DFT, with the help of volume-energy optimisation curves, the ferromagnetic (FM) state is more stable in energetic than the
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Effect of substituted VIB transition metals on structural, electronic and magnetic properties of indium oxide: spin density functional calculations Philos. Mag. (IF 1.778) Pub Date : 2020-11-16 Worasak Sukkabot
ABSTRACT The main raising propose in material science is to modify the structural, electronic, optical and magnetic properties. Here, the effect of substituted VIB transition metals in In2O3 semiconductor is analysed utilising the spin density functional theory with the generalised gradient approximation (GGA) by Perdew–Burke–Ernzerhof (PBE) formulation. W doping in In2O3 semiconductor is the most
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Electrochemical impedance spectroscopy study of AgI–Ag2O–MoO3 glasses: understanding the diffusion, relaxation, fragility and power law behaviour Philos. Mag. (IF 1.778) Pub Date : 2020-11-16 B. Tanujit; S. Asokan
ABSTRACT Electrochemical Impedance Spectroscopy and Raman studies are performed on fast ion conducting, AgI–Ag2O–MoO3 glasses, over a wide range of composition to understand the features of structure, ion migration and their correlation. These features essentially involve diffusion and relaxation. The coefficients associated with diffusion process, especially, the diffusion coefficient, diffusion length
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On the breakdown of the Nix-Gao model for indentation size effect Philos. Mag. (IF 1.778) Pub Date : 2020-11-11 Petr Haušild
ABSTRACT A new approach accounting for the indentation size effect in metals with the dislocation mediated deformation mechanism is proposed in the paper. The model is based on the assumption that the number of dislocations contained in the ‘effective’ plastic zone under the contact area incrementally scales with the penetration depth with h m , which leads to the modification of the Nix-Gao model
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Variations in the band gap of semiconducting glassy chalcogenides with composition Philos. Mag. (IF 1.778) Pub Date : 2020-11-06 R. Neffati; Imed Boukhris; Imen Kebaili; A. Dahshan
ABSTRACT Semiconducting glassy chalcogenides (ChGs) have broad technological applications owing to the ability to tune their band gap through composition change. However, there is a lack of theoretical models predicting the band gap in ternary and quaternary compounds of these amorphous materials which are the most industrially used. After a critical review of some existing models concerning mainly
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Predicting radiation damage in beryllium Philos. Mag. (IF 1.778) Pub Date : 2020-11-04 Y. R. Than; R. W. Grimes
ABSTRACT Displacement damage in beryllium was predicted as a function of temperature and energy using molecular dynamics simulations. A key aim of this study was to determine if average results from large displacement cascades correspond to values predicted by the Kinchin–Pease (K–P) model. The number of residual defects remaining after 1 ps increased linearly with primary knock-on atom (PKA) energy
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Structural heritage of metallic glasses and relevant crystals understood via the principal cluster Philos. Mag. (IF 1.778) Pub Date : 2020-08-26 Jixiang Chen; Jiale Zhao; Yi Cheng
ABSTRACT Structural heritage between bulk metallic glasses (BMGs) and their relevant crystals has already been acknowledged. But how this kind of heritage is represented is still unclear. In the present paper, firstly, two important characters are considered to determine the principal cluster of crystal, i.e. the atomic-packing efficiency which is evaluated by atomic density radial distribution method
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CO2 adsorption on pure and oxidised Ni nano-structures deposited on mica surfaces Philos. Mag. (IF 1.778) Pub Date : 2020-11-01 K. W. B. Hunvik; B. Pacáková; S. Raaen
ABSTRACT Adsorption and desorption of CO 2 on metallic and oxidised Ni nano-structures supported on mica (muscovite) substrates have been studied by temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Predominantly physisorption was observed at low temperatures near 130 K. Weak desorption features were found at temperatures up to about
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Understanding raft formation and precipitate shearing during double minimum creep in a γ′-strengthened single crystalline Co-base superalloy Philos. Mag. (IF 1.778) Pub Date : 2020-10-28 F. Xue; C. H. Zenk; L. P. Freund; S. Neumeier; M. Göken
ABSTRACT The compressive creep deformation behavior of a Co-base single-crystalline superalloy is studied in the high temperature / low stress regime at 950°C/150 MPa. Emphasis is placed on the mechanisms causing the double minimum creep behavior consisting of a local and a global creep rate minimum. The local minimum occurs at ∼0.2% strain with dislocation accumulation at γ/γ′ interfaces after bowing
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Effects of rare earth elements (Ce, La) on microstructure and mechanical properties in compacted graphite iron Philos. Mag. (IF 1.778) Pub Date : 2020-10-28 Jianan Zhu; Xintong Lian; Hengchang Lu; Qingyi Liu; Ailong Jiang; Duo Fang; Han Dong; Dexiang Xu
ABSTRACT Microstructure and mechanical properties of compacted graphite iron (CGI) alloyed with different additions of rare earth (RE) elements are analysed in this paper. Experimental results show that graphite presents mostly vermicular shape when the content of RE is less than 0.041%. The shape of graphite becomes spherical after more RE is added. Tensile strength is improved significantly with
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Prediction of residual stresses of second kind in deep drawing using an incremental two-scale material model Philos. Mag. (IF 1.778) Pub Date : 2020-08-18 J. Hofinger; H. Erdle; T. Böhlke
ABSTRACT For modern engineering applications, the prediction of residual stresses is a starting-point for the subsequent optimisation of the design with regard to the process induced stresses on the macro and the grain scale. In this paper, a new approach for the numerically efficient prediction of phase-specific residual stresses (residual stresses of second kind) in two-phase materials is presented
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A dislocation assisted self-consistent constitutive model for the high-temperature deformation of particulate metal-matrix composite Philos. Mag. (IF 1.778) Pub Date : 2020-10-19 M. Rezayat; M.H. Parsa; H. Mirzadeh; J.M. Cabrera
ABSTRACT A dislocation assisted self-consistent model based on Tandon and Weng approach and Bergstrom dynamic recovery model for particulate-reinforced composites has been extended to consider the matrix evolution during high-temperature deformation on flow stress. The impact of main influential processing parameters such as temperature, strain, and strain rate in addition to reinforcement characteristics
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Superstructure formation in a ternary Yb-Cd-Mg 1/1 quasicrystal approximant Philos. Mag. (IF 1.778) Pub Date : 2020-10-19 Tsunetomo Yamada
ABSTRACT The superstructure and basic structure of ternary Yb-Cd-Mg 1/1 quasicrystal approximants with the compositions Yb 12.9 Cd 78.4 Mg 8.8 and Yb 13.3 Cd 64.2 Mg 22.5 were investigated using X-ray structural analysis. The former was determined to have a face-centred packing structure comprising two distinguishable Tsai-type rhombic triacontahedron clusters (space group F d 3 ¯ , a = 31.377 ( 1
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Effect of Ni/Fe ratio on microstructure, tensile flow and work hardening behaviour of tungsten heavy alloys in heat treated and swaged conditions Philos. Mag. (IF 1.778) Pub Date : 2020-10-13 Ashutosh Panchal; K. Venugopal Reddy; P. A. Azeem; Rajdeep Sarkar; Archana Paradkar; T. K. Nandy; A. K. Singh
ABSTRACT The present work describes the effect of Ni/Fe ratio on microstructure, tensile flow and work hardening behaviour of tungsten heavy alloys (WHAs) based on 92 wt. % W with varying Ni/Fe ratios in heat treated and swaged conditions. Evaluation of properties in the heat treated and swaged conditions reflect that the increasing Ni/Fe ratio has resulted in the enhancement of tensile as well as
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Structural and magnetic characterisation of Co substituted Ni2MnSb Heusler alloy: effect of cobalt substitution on magnetism and Curie temperature Philos. Mag. (IF 1.778) Pub Date : 2020-10-13 Erdinc Oz; Fermin Ak; Buket Saatci
ABSTRACT In this study, Ni2-x Co x MnSb full-Heusler alloys (1.00 ≤ x ≤ 1.75) were prepared by arc melting process, and examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), and SQUID. The L21 crystal structure of the synthesised Heusler alloy was confirmed by XRD patterns, and it was observed that the use of Co instead of Ni caused a decrease in the interatomic distance. The magnetisation
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Hot deformation induced microstructure evolution of a novel as-extruded Ni-based P/M superalloy Philos. Mag. (IF 1.778) Pub Date : 2020-10-06 Y.L. Wang; Y. Li; H. Zhang; J.Z. Guo
ABSTRACT Hot extrusion (HEX) and isothermal forging (ITF) are two critical processing methods in manufacturing of Ni-based powder metallurgy (P/M) superalloys. Hot compressions with different parameters were performed on a novel Ni-based P/M superalloy in as-extruded condition to simulate ITF and the related microstructure evolution. The results revealed that the as-extruded alloy was fully recrystallised
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Temperature dependence of interaction parameters for Al–Li liquid alloy Philos. Mag. (IF 1.778) Pub Date : 2020-09-29 R. K. Gohivar; S. K. Yadav; R. P. Koirala; G. K. Shrestha; D. Adhikari
ABSTRACT In the studies related to thermodynamic and structural functions of liquid alloys at high temperatures using linear temperature-dependent interaction parameters, in some cases, artificial miscibility gaps or artefacts are noticed. These artificial miscibility gaps in these functions at higher temperatures are usually asymmetric with respect to the concentration. The presence of the artificial
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Effect of transition elements on dispersoid formation and elevated-temperature mechanical properties in 6082 aluminum alloy Philos. Mag. (IF 1.778) Pub Date : 2020-09-29 E. M. Elgallad; K. Liu; Z. Zhang; X.-G. Chen
ABSTRACT The effect of transition elements, specifically Mn, Cr, V, and Mo, on dispersoid formation and mechanical properties in 6082 aluminum alloy was studied. The elevated-temperature mechanical properties were evaluated based on the compressive yield strength and creep resistance. The results indicated that the addition of Mn to the 6082 alloy resulted in the formation of a large number of the
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Spatio-temporal dynamics of jerky flow in high-entropy alloy at extremely low temperature Philos. Mag. (IF 1.778) Pub Date : 2020-09-27 Z. Pu; Z. C. Xie; R. Sarmah; Y. Chen; C. Lu; G. Ananthakrishna; L. H. Dai
ABSTRACT Despite a large body of literature, mechanisms contributing to low temperature jerky flow remain controversial. Here, we report a cross-over from a smooth at room and liquid nitrogen temperatures to serrated plastic flow at 4.2 K in high-entropy CrMnFeCoNi alloy. Several complimentary investigations have been carried out to get a coherent physical picture of low temperature jerky flow in these
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Zeeman splitting, Zeeman transitions and optical absorption of an electron confined in spherical quantum dots under the magnetic field Philos. Mag. (IF 1.778) Pub Date : 2020-09-24 E. B. Al; E. Kasapoglu; H. Sari; I. Sökmen
ABSTRACT In this study, we present a detailed theoretical investigation of the effect of an externally applied magnetic field on the energy states 1 s , 1 p , 1 d and 1 f in the spherical quantum dot with finite and infinite confinement potentials. For both finite and infinite spherical quantum dot, the first four electron energies, Zeeman transition energies between these electronic states and optical
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On the strengthening and the strength reducing mechanisms at aluminium matrix composites reinforced with nano-sized TiCN particulates Philos. Mag. (IF 1.778) Pub Date : 2020-09-21 Lubomir Anestiev; Rumyana Lazarova; Peter Petrov; Vanya Dyakova; Lenko Stanev
The influence of the volume fraction of nano-sized TiCN reinforcement additive on the mechanical properties and the microstructure of Al-based composite was studied. It was found that the addition of nano-sized TiCN particulates into the Al-matrix leads to a substantial improvement of the mechanical properties of the composite, TiCN-Al. However, the obtained results showed that the strengthening effect
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The role of electric current in the formation of white-etching-cracks Philos. Mag. (IF 1.778) Pub Date : 2020-09-18 P.-Y. Tung; E. McEniry; M. Herbig
ABSTRACT Material failure by white-etching-cracks (WECs) can cause enormous economic costs. The formation of WECs emerges from the decomposition of the original, usually cementite-containing, microstructure. As small amounts of electric current can trigger this failure mechanism, we investigate the contribution of electric current to cementite decomposition. We applied ∼700 A/cm2 for two weeks at 60°C
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XV International Workshop on Complex systems Andalo (Trento) Italy. 17–20 March 2019 Philos. Mag. (IF 1.778) Pub Date : 2020-09-15 Giacomo Baldi; Aldo Fontana; Giulio Monaco; Marco Zanatta
(2020). XV International Workshop on Complex systems Andalo (Trento) Italy. 17–20 March 2019. Philosophical Magazine: Vol. 100, Andalo special Issue on Complex systems, pp. 2543-2543.
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Non-hydrodynamic modes in viscoelastic behaviour of simple fluids Philos. Mag. (IF 1.778) Pub Date : 2020-08-22 Taras Bryk; Ihor Mryglod; Giancarlo Ruocco
We discuss the role of non-hydrodynamic processes in viscoelastic transition in pure liquids. In particular, using both analytical results and molecular dynamics simulations, we clarify the effect of the shear stress relaxation on the transverse dynamics. We use as an example the Lennard-Jones fluids. We analyse the frequency dependence of the shear modulus and its connection to the non-hydrodynamic
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Publisher’s Note Philos. Mag. (IF 1.778) Pub Date : 2020-09-15
(2020). Publisher’s Note. Philosophical Magazine: Vol. 100, Andalo special Issue on Complex systems, pp. 2658-2658.
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Austenite grain growth kinetics and mechanism of grain growth in 12Cr ultra-super-critical rotor steel Philos. Mag. (IF 1.778) Pub Date : 2020-09-15 Yue Xu; Jiansheng Liu; Yu Zhao; Yongxing Jiao
ABSTRACT In this paper, the austenite grain growth behaviour of 12Cr ultra-super-critical (USC) rotor steel was investigated by a series of heat treatments. The heat treatments at heating temperatures of 900°C–1250°C and holding time of 1 h–20 h were conducted in an electric box-type heating furnace. Experimental results showed that the sizes of austenite grain were affected by heating temperatures
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Correction Philos. Mag. (IF 1.778) Pub Date : 2020-07-01
(2020). Correction. Philosophical Magazine: Vol. 100, No. 19, pp. 2540-2541.
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Subsurface defect evolution and crystal-structure transformation of single-crystal copper in nanoscale combined machining Philos. Mag. (IF 1.778) Pub Date : 2020-09-01 Haiyan Li; Zihao Shao; Ruicheng Feng; Yongnian Qi; Qin Wu; Chunli Lei
ABSTRACT In the paper, molecular dynamics simulation is applied to study the evolution and distribution of subsurface defects during nanoscale machining process of single-crystal copper. The chip-removal mechanism and the machined-surface-generative mechanism are examined through analysis of the dislocation evolution and atomic migration of the workpieces. The findings show that under different stresses
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Electronic, optical and magnetic properties of PrXO3(X = V, Cr): first-principle calculations Philos. Mag. (IF 1.778) Pub Date : 2020-08-31 Muhammad Yaseen; Hina Ambreen; Javed Iqbal; Ali Shahzad; Roha Zahid; Nessrin A. Kattan; Shahid M. Ramay; Asif Mahmood
ABSTRACT Electronic, optical and magnetic properties of perovskite oxides PrXO3(X = V, Cr) are calculated by first-principle calculations. The calculations of electronic band structure and density of states (DOS) show that the PrVO3 exhibits metallic behaviour, while PrCrO3 exhibits half-metallic nature with direct band gap. The calculated band gap of PrCrO3 is 2.7 in the minority spin state. The origin
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Straight and curved disclinations and dislocation equivalents Philos. Mag. (IF 1.778) Pub Date : 2020-08-26 J. P. Hirth; R. W. Armstrong
ABSTRACT Traditionally, for hard materials, two types of straight disclinations are identified although some Somigliana disclinations with different aspects have been treated theoretically. Here, we consider four physically distinct types of curved generalised disclinations, one of which reduces to two straight types, giving a total of five. We indicate typical applications for the different types
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Oriented stability and its application in texture control Philos. Mag. (IF 1.778) Pub Date : 2020-08-24 Xi Chen; Yuhui Sha; Songtao Chang; Fang Zhang; Liang Zuo
ABSTRACT Orientation rotation tendency with respect to target orientation in body-centred cubic (bcc) crystal is investigated under different rolling modes. Oriented stability is proposed to describe the rotation rate towards target orientation in contrast to conventional orientation stability. The oriented stability distribution in Euler space can clearly present how an orientation contributes to
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Multiphase modelling of the growth kinetics of precipitates in Al-Cu alloys during artificial aging Philos. Mag. (IF 1.778) Pub Date : 2020-08-19 Tohid Naseri; Daniel Larouche; Pierre Heugue; Rémi Martinez; Francis Breton; Denis Massinon
ABSTRACT In the aluminum industry, the needs of predictability of the kinetics of precipitation during the artificial aging processes increase as the targeted applications require the maximisation of properties at the lowest costs possible. In this regard, kinetics modelling can be helpful to design the heat treatment processes. Despite using many fitting parameters, available models show a lack of
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In-situ TEM investigation of structural transformation from LEDS to twin in fatigued Cu single crystal during annealing Philos. Mag. (IF 1.778) Pub Date : 2020-08-19 P. Li; L. W. Kong; Z.X. Zhang; J. Zhao; C.C. Du; J.Y. Huang; Z.F. Zhang
ABSTRACT Low-energy dislocation structure is one classical self-organised dislocation pattern, among which persistent slip band (PSB) ladders is the most representative. Periodically distributed PSB ladders consist of two phases: matrix phase and pattern phase. In the new two-phase model, the appearance of pattern phase results in the softening of PSBs with lower elastic constant. The formation of
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