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Design of carbide free bainitic steels for hot rolling practices Philos. Mag. Lett. (IF 1.2) Pub Date : 2024-03-02 Radhakanta Rana, Erick Cordova-Tapia, Jose A. Jimenez, Lucia Morales-Rivas, Carlos Garcia-Mateo
In this work, we provide with an overview of the main theories, metallurgical and microstructural concepts used for the design of carbide free bainitic steels adapted to industrial hot rolling and ...
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Simplification of selective imaging of dislocation loops: diffraction-selected on-zone STEM Philos. Mag. Lett. (IF 1.2) Pub Date : 2024-02-29 Masaya Kozuka, Yuichi Miyahara, Tomohiro Kobayashi
Contrary to the conventional belief that, in transmission electron microscopy (TEM), selective and sharp imaging of dislocation loops can be realized only by accurate tilting of a specimen from the...
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Formation mechanism of recrystallisation internal friction peak and its application to determine the recrystallisation temperature of deformed pure Cu Philos. Mag. Lett. (IF 1.2) Pub Date : 2024-02-01 Tianlu Chen, Meng Sun, Run Yang, Rui Liu, Weibin Jiang, Tao Zhang, Xuebang Wu, Xianping Wang, Changsong Liu, Qianfeng Fang
The formation mechanism of a recrystallisation internal friction (IF) peak superimposed on a grain boundary (GB) IF peak for deformed copper was studied. The P1 peak, associated with the recrystall...
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Study of the effect of dual-phase transformation on the processing map of Al0.9FeCoNiCr high-entropy alloys under peak stress conditions Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-12-22 Jianlin Li, Ge Zhou, Jinke Han, Yuhan Peng, Haoyu Zhang, Siqian Zhang, Lijia Chen, Xue Cao
Single-pass thermal compression simulation experiments were performed on a dual-phase Al0.9FeCoNiCr high-entropy alloy at strain rates of 1–0.001 s−1, temperatures of 850–1050°C (true strain of 0.9...
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A generalised FK model for the 558 line defect in graphene Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-12-22 Yin Yao, Jingjing Yang, Yafeng He, Jianhui Bai
Defects in two-dimensional nanomaterials do not always affect their properties negatively, but often have useful functionality. The 558 line defect in graphene distinctively acts as a quasi-one-dim...
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A distinctive kinetics transition from stable hcp to metastable fcc dendrite growth within liquid Re95W5 refractory alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-11-28 Maojie Lin, Liang Hu, Ruilin Xiao, Xiannian Zhu, Pengxu Yan, Bingbo Wei
A transition of dendrite growth kinetics from stable hcp to metastable fcc phases was observed for refractory Re95W5 alloy in an electrostatic levitation state, which attained a liquid undercooling...
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Changes in hydrogen states after interactions between hydrogen and stress-induced martensite transformation for Ni–Ti superelastic alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-10-28 Ryosuke Hayashi, Ken’ichi Yokoyama
Changes in hydrogen states after dynamic interactions between hydrogen and a stress-induced martensite transformation have been investigated for Ni–Ti superelastic alloy. After homogenised hydrogen...
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A method for designing filament-wound composite frame structures using a data-driven evolutionary optimisation algorithm EvoDN2 Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-10-28 Anna Malá, Zdeněk Padovec, Tomáš Mareš, Nirupam Chakraborti
A methodology of optimising composite frame structures has been applied to three selected geometries. A cyclic process driven by predefined objectives achieved the most desirable parameters through...
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Regression-based detection of missing boundaries in multiphase polycrystalline microstructures Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-07-25 Manoj Prabakar, Prince Gideon Kubendran Amos
ABSTRACT An efficient alternative approach for detecting missing boundaries in micrographs is presented in the current work. By treating the missing boundaries as a class of object, a suitable detection algorithm is extended to realise discontinuities in interfaces separating phases and grains. The metrics, including precision and recall, estimated during the development of the model indicate noteworthy
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Microstructure and properties of ultrasonic-assisted gallium-based alloys for room-temperature bonding of Cu/Cu Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-07-07 Qu Yingying, Fang Qiuyue, Zhao Liang, Guo Zuoxing
ABSTRACT Room-temperature welding with gallium is regarded as a new strategy because of the low melting point of gallium and its affinity for forming intermetallic compounds with other metals. Benefitting from liquid gallium-based solder and an ultrasonic drive, the establishment of Cu/Cu diffusion-bond connections can be quickly completed. The underlying characteristics for the weld quality of room-temperature
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Microstructure characteristics in weld zone of the novel thick 08Cr9W3Co3VNbCuBN heat-resistant steel welded joint by fusion welding Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-06-27 Hong-ju Fan, Peng Liu, Yong-bin Wang, Xin-fang Guo
ABSTRACT One of the primary candidate materials used in 650°C ultra-supercritical (USC) thermal power plant units is a novel thick grade of heat-resistant steel, 08Cr9W3Co3VNbCuBN (G115), for which China has complete intellectual property rights. In this study, G115 steel with a 115 mm thick wall was successfully welded using gas tungsten arc welding (GTAW) + shielded metal arc welding (SWAM), which
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Pore structure and gasification activity of coal and coke studied by small-angle X-ray scattering Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-05-17 Shujiao Zhang, Peng Xiao, Peng Wu, Xu He, Dongfeng Li, Ziming Wang
ABSTRACT Carbonisation is one of the important methods to improve the utilisation of coal. The structural composition of coal plays an important role in coal carbonisation. This work used small-angle X-ray scattering (SAXS) to investigate the pore structure of three kinds of raw coals with different carbon content derived from Xingtai City, Hebei Province, China. The structures of the corresponding
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Microstructure and mechanical properties of NiCoCrAlY laser cladding coating after high-current pulsed electron beam irradiation Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-03-20 Bowen Chen, Yuxin Li, Jinhao Nie, Chen Wei, Lihua Dang, Qingjun Ma
ABSTRACT Surface modification of laser cladding coating NiCoCrAlY was carried out by high-current pulsed electron beam irradiation. The microstructure of the NiCoCrAlY coating after irradiation was studied by XRD and SEM. The results showed that the NiCoCrAlY cladding layer displays slip and a nanocrystalline structure following high-current pulsed electron beam irradiation. The high-density slip structure
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On a thermodynamic foundation of Eyring rate theory for plastic deformation of polymer solids Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-03-18 Koh-hei Nitta
ABSTRACT The plastic deformation of almost all solid polymers can be represented by a thermally activated rate process involving the motion of cooperative mobile elements over potential barriers, based on the Eyring activated rate theory. The present study shows that the governing equations for the Eyring rate theory can be completely derived based on the principle of microscopic reversibility in the
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Prospect for application of radial distribution function in coal carbonisation research Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-02-17
Published in Philosophical Magazine Letters (Vol. 103, No. 1, 2023)
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Comparative study of microstructure and mechanical properties of thermo-mechanically processed Al(0.2, 0.5) CoCrFeNiMo0.5 high-entropy alloys Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-02-14 Yasam Palguna, Rajesh Korla
ABSTRACT The main objective of the present work is to produce AlxCoCrFeNiMo0.5 alloy through a wrought process. AlxCoCrFeNiMo0.5 high-entropy alloys with two different Al contents (x = 0.2 and 0.5) were prepared by vacuum arc melting followed by thermo-mechanical processing. Microstructural evolution was investigated after hot forging and subsequent homogenisation using XRD, SEM, and TEM. The final
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Notch sensitivity of combined mode I–II fracture behaviour of a rolled magnesium alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-02-14 Dhrubjyoti Baruah, K. V. Vaishakh, S. Arjun Sreedhar, Saurabh Kumar Gupta, Satyam Suwas, R. Narasimhan
ABSTRACT Fatigue pre-cracked four-point bend specimens of a rolled AZ31 Mg alloy are loaded asymmetrically and their mixed-mode (I and II) fracture behaviour is contrasted with pre-notched samples. In-situ mapping of displacement and strain fields is performed through optical imaging coupled with digital image correlation analysis. The fracture surface morphology and the deformed microstructure are
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Effect of ultrasonic treatment on grain refinement and mechanical properties of Al-2Mg alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2023-01-12 Ashish Thakur, Ramendra Kumar Gupta, V. Udhayabanu, D. R. Peshwe, Y. Y. Mahajan
ABSTRACT In the present study, to achieve grain refinement and enhance the mechanical properties of Al-2Mg alloy, ultrasonic treatment (UT) has been applied to the melt. The effects of this treatment on the microstructure, porosity alleviation, and mechanical properties of Al-2Mg have been thoroughly investigated. A microstructure study of the Al-2Mg UT alloy has revealed a noteworthy enhancement in
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Prospect for application of radial distribution function in coal carbonisation research Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-12-15 Xiaoxia Shang, Meijun Wang, Zhihong Li, Liping Chang, Yanfeng Shen
ABSTRACT Carbonisation is an important way of comprehensive utilisation of coal. In this short contribution, the application of wide angle X-ray scattering (WAXD) and radial distribution function (RDF) in coal carbonisation research is briefly reviewed and prospected. General WAXD analysis can only provide basic geometrical structural parameters of crystals in the sample; while RDF derived from WAXD
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Electric field influenced coordinate jump of the guiding centre and magnetotransport Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-12-12 Jingjing Feng, Yang Gao, Qian Niu
ABSTRACT Our studies formulate a classical theory to study the influence of in-plane electric field on electron-impurity scattering process and magnetotransport in a two-dimensional space, in the presence of a strong out-of-plane magnetic field. Our studies connect classical scattering and quantum Landau Level broadening, as will be reviewed in this report. We derived an electric current formula in
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Deformation behavior at cryogenic temperature in extruded Mg–Al–Zn alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-11-18 Hidetoshi Somekawa, Yukiko Ogawa, Yoshinori Ono, Alok Singh
ABSTRACT The effect of grain size on tensile deformation behaviors at room- and cryogenic-temperatures was examined using extruded Mg–Al–Zn (AZ31) alloys with different average grain sizes of 3.7, 14.0, and 38.7 μm. The mechanical properties were influenced by the grain size as well as the testing temperature. Strength increased with a finer grained structure and a lower testing temperature. Regarding
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Structure evolution of vacancy-hydrogen complexes in a nickel-based single-crystal superalloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-11-12 Xiao-Zhi Tang, Xiao-Tong Li, Ya-Fang Guo
ABSTRACT The structural stability of vacancy-hydrogen complexes at the γ′/γ interface in nickel-based single-crystal superalloy is accessed mainly by calculating the activation energies associated with the evolution of their structures. It is found that the structure evolution and subsequent decomposition of the complex needs little time to be thermally activated at the service temperature of an aeroengine
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Effect of size and vacancy defects on buckling properties of arsenene nanosheets Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-11-07 Zhenyu Sun, Guili Liu, Juan Guo
ABSTRACT Vacancy defects and size variations are inevitable in the preparation of arsenene nanosheets, and the effect of size and random distribution of vacancy defects on the buckling properties of arsenene nanosheets is not negligible. Previous research methods, such as molecular dynamics, have limitations in terms of computational cost when investigating this aspect. In this paper, a model of arsenene
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A comparative study of flow instability criteria in the processing map of AlFeCoNiMo0.2 high-entropy alloys Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-10-21 Jianlin Li, Jinke Han, Fance Song, Haoyu Zhang, Ge Zhou, Lijia Chen, Xue Cao
ABSTRACT High-entropy alloys (HEAs) were studied via hot compression experiments using a Gleeble-3800 thermal simulation tester. The hot deformation behaviour of an AlFeCoNiMo0.2 HEA and the physical significance of the associated parameters were analyzed according to the Prasad, Gegel, Malas, and Murty instability criteria. Processing maps of different instability criteria under different conditions
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Preparation and characterisation of the Al-Cr-Fe-Mn-Mo high-entropy alloy reinforced by in-situ formed carbides Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-10-20 T. Stasiak, M. A. Sow, M. Touzin, F. Béclin, C. Cordier
ABSTRACT This study aimed to prepare a composite of the high-entropy alloy from the Al-Cr-Fe-Mn-Mo system reinforced by in-situ formed carbides using powder metallurgy techniques. The alloyed powder was prepared by mechanical alloying in ball-mill devices from pure elemental powders with the addition of a process control agent, namely stearic acid. Then, the alloyed powder was consolidated by hot-press
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Influence of Co content on the simultaneous enhancement of strength and ductility in severely drawn textured Ni-Co microwires Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-10-06 Girish Bojjawar, Satyam Suwas, Atul H. Chokshi
ABSTRACT This study examines the deformation behaviour of Ni-Co microwires exhibiting high strengths and ductility, where the addition of Co is intended to decrease the stacking fault energy. A reduction in stacking fault energy is likely to retard the recovery processes, refine grain size and enhance strain hardening by dislocation interactions at twin boundaries. Microwires were drawn to a strain
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An analytical model of grain growth considering the conjoint effects of precipitate pinning and solute drag in steel Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-10-06 Joydeep Maity
ABSTRACT An analytical model is developed to explain the kinetics of grain growth in steel that takes into account all feasible prime phenomena; namely, surface energy reduction, precipitate pinning effect and solute drag effect. The shapes of matrix grains and the precipitates are assumed to be tetrakeidecahedron and spherical, respectively. A single solute and a single type of precipitate are further
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High-temperature oxidation behaviour of SPS-prepared Mo and Mo–5Ta alloys Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-10-06 Dawei Liu, Jiuxing Zhang, Lei Huang, Song Li, Binrong Nong, Ying Jin, Yafei Pan
ABSTRACT The high-temperature oxidation behaviour of SPS-prepared Mo and Mo–5Ta alloys are investigated under the temperature range 300–700°C for 0–120 min in static air condition. The oxidation weight gains of Mo and Mo–5Ta conform to parabolic law at different oxidation times of 500°C and all remain at low levels. At low temperature (≤ 500°C), the oxidation resistance improves with Ta addition. However
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Continuousness of interactions between hydrogen and plastic deformation of ultra-high strength steel sheet consisting of ferrite and nanometer-sized precipitates Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-09-29 Katsutoshi Takashima, Ruoyu Han, Ken’ichi Yokoyama, Yoshimasa Funakawa
ABSTRACT The continuousness of the interactions between hydrogen and plastic deformation of an ultra-high strength steel sheet consisting of ferrite and nanometer-sized precipitates has been investigated by tensile tests after or during cathodic hydrogen charging. In the tensile test in the air after hydrogen pre-charging, a hydrogen thermal desorption analysis shows that the amount of hydrogen desorbed
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Elucidating the role of micro-galvanic coupling between eutectic α-Mg lamellas and α-Mg matrix on the hydrogen evolution behaviour of Mg-0.6Ca binary alloy using real-time imaging Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-09-20 Chetan Singh, Sudhanshu Shekhar Singh, Jayant Jain
ABSTRACT The hydrogen evolution process in the as-cast Mg-0.6Ca alloy was investigated using real-time optical imaging of the corroding surface. It was revealed that hydrogen evolved as large stable bubbles and continuous streams of tiny bubbles because of high localised current density. To the best of the author’s knowledge, this is the first attempt to characterise the hydrogen evolution behaviour
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Microstructure and mechanical properties of the new TiZrHfReAl HCP high entropy alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-09-20 Bejjipurapu Akhil, Anurag Bajpai, Krishanu Biswas
ABSTRACT In the present study, the intelligent addition of Re and Al to TiZrHf equiatomic ternary alloy resulted in a new single-phase Ti30Zr30Hf30Re5Al5 HCP high entropy alloy. The XRD analyses show that the TiZrHfRex alloys have a single-phase HCP structure until x = 5 at.%. Subsequently, the TiZrHfRe5 retains its single-phase HCP microstructure with the addition of Al upto 5 at.%, leading to a new
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A complete study on the temperature dependences of zero-field splitting b40 for Eu2+ and Gd3+ ions in CdF2 crystal Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-09-05 Yang Mei
ABSTRACT This paper gives for the first time a complete equation to analyze the temperature dependence (or thermal variation) of spin-Hamiltonian parameter from low to high temperatures for transition metal and rare-earth ions in crystals. This equation includes not only the dynamic effect (only considered in previous papers) caused by electron–phonon interaction but also the static effect owing to
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Experimental verification of molybdenum segregation for large-scale slab ingots of Ti–0.3Mo–0.8Ni alloy during electron-beam cold-hearth melting Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-07-21 Zhenze Zhu, Zulai Li, Rongfeng Zhou, Haiguang Huang, Wentao Xiong, Xiangming Li
ABSTRACT Ti–0.3Mo–0.8Ni alloy has excellent corrosion resistance and is widely used in making crystallizers, heaters and evaporators for salt production, as well as chemical reactors and heat exchangers. To study the distribution of Mo in the Ti–0.3Mo–0.8Ni alloy during electron beam cold hearth melting, the solidification process has been numerically modelled and the calculations compared with experimental
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Hidden symmetry in 1D localisation Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-07-13 I. M. Suslov
ABSTRACT Resistance ρ of an one-dimensional disordered system of length L has the log-normal distribution in the limit of large L. Parameters of this distribution depend on the Fermi level position, but are independent on the boundary conditions. However, the boundary conditions essentially affect the distribution of phases entering the transfer matrix and generally change the parameters of the evolution
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Gibbsian interpretation of Langmuir, Freundlich and Temkin isotherms for adsorption in solution Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-06-20 Lei Lu, Chongzheng Na
ABSTRACT Adsorption is a physicochemical phenomenon important in both natural and engineering processes. In the research and practice of adsorption equilibrium, a long-standing challenge is how to reconcile the classical models proposed by Gibbs, Langmuir, Freundlich, and Temkin for interpreting experimentally obtained adsorption isotherms. Here, we show that the Langmuir, Freundlich, and Temkin isotherms
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Physical constitutive relational model and structure evolution during dynamic recovery of 23Co14Ni12Cr3MoE (A-100) high-strength steel Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-06-20 Jinke Han, Jianlin Li, Yifan Zhang, Haoyu Zhang, Ge Zhou, Lijia Chen
ABSTRACT The hot compression of A-100 steel at 850–1150°C and strain rate of 0.01–10 s−1 was tested on a Gleeble-3800 thermal simulation machine to determine the corresponding true stress–strain curve. Based on theoretical calculation, the dislocation density factor was introduced into the Avrami equation and thereby a dynamic recovery physical constitutive relational model based on dislocation density
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Nanoscale face-centered-cubic zirconium dispersed in omega zirconium Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-05-23 Xinu Tan, Risheng Qiu, Yushun Liu, Fengxian Bi, Jinlong Zhang, Boran Tao, Qing Liu
ABSTRACT In contrast to lamella-like face-centered cubic zirconium (FCC-Zr) distributed inside an α-Zr matrix, as repeatedly reported previously, dispersed and nanoscale FCC-Zr with lattice parameter a = 0.520 nm has been found inside lamella-like and blocky ω-Zr by transmission electron microscopy (TEM). The orientation relationship between the FCC-Zr and the ω-Zr obeys [001]FCC//[1 1¯02]ω, (100)FCC//(11
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Dislocation multiplication and dynamics in an aluminium alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-04-22 Tiantian Huang, Fei Liu, Zhiyi Liu, Guangyu He, Yangcheng Hu
ABSTRACT A mechanism of dislocation multiplication is introduced. The surface of the Al20Cu2Mn3 phase in an Al alloy can act as a barrier to impede dislocation movement. When two dislocations with opposite Burgers vectors approach each other, dislocations can annihilate if the pair remains at a distance less than the critical distance for annihilation. A dislocation loop is then formed around the Al20Cu2Mn3
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Effect of secondary rolling on the interfacial bonding strength and mechanical properties of Al/Mg/Al clad plates Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-04-22 Xiang Cao, Chun Xu, Yu Li, Xuecheng Cao, Ruizhi Peng, Junyi Fang
ABSTRACT The effects of secondary rolling on the microstructure evolution and mechanical properties of Al/Mg/Al clad sheets have been investigated. The results indicate that a double-layer intermetallic compound (Mg2Al3 and Mg17Al12) forms and sandwiches the MgO film during the first rolling and annealing, while the sandwich structure shows a low peel strength owing to the intrinsic brittleness of
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Deformation mechanisms in the directionally solidified nickel-based CM247LC at room temperature Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-03-17 Zhenhuan Gao, Peng Zhang, Qian Niu, Jiao Li, Liping Nie, Xiufang Gong, Xiaolong Song
ABSTRACT After solutionizing and aging at 980°C for various durations, the compressive deformation behaviour and mechanisms of the directionally solidified nickel-based superalloy CM247LC are investigated at room temperature. Experimental results show that the yield strength decreases gradually from 991 ± 1.2–672 ± 7.5 MPa with increasing the γ′ precipitate size from 145 ± 2–604 ± 19 nm. Transmission
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Ex-situ study of diffusion in liquid Al–Cu melts under a transverse magnetic field using X-ray imaging Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-03-09 Ying Liu, Wenhao Lin, Bangfei Zhou, Xianghui Guo, Hao Cai, Tianxiang Zheng, Biao Ding, Yunbo Zhong, Lei Zhang
ABSTRACT Al–Cu melts were used to study interdiffusion under a transverse magnetic field (TMF) using X-ray imaging. A novel gravity-assisted automatic docking device was used to create a long capillary of the diffusion couple. Compared with the results acquired using energy-dispersive spectroscopy, X-ray imaging is more convenient and accurate to determine concentration profiles along long capillaries
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Orientation relationship of quasicrystalline approximate phase η-Al5(Mn,Cr) in AA5083 aluminium alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-02-23 Xiaoling Xiao, Hongwei Liu, Huilan Huang, Wenlong Chen, Yanfang Ma
ABSTRACT A quasicrystalline approximate monoclinic phase η-Al5(Mn,Cr) with a plate-like or rod-like morphology in AA5083 aluminium alloy was investigated using transmission electron microscopy. Several types of orientation relationships (ORs) between the η-Al5(Mn,Cr) phase and the α-Al matrix were observed and these ORs could be correlated with a rotation operation around the axis [001]η with an angle
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Modelling of cavity growth during the superplastic flow of a fine-grained Ti–6Al–4V titanium alloy processed by direct rolling Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-02-23 Xin Wang, Ge Zhou, Chao Liu, Siqian Zhang, Haoyu Zhang, Feng Li, Lijia Chen
ABSTRACT Ti–6Al–4V fine-grained plates were manufactured using a rolling method and then subjected to superplastic tensile tests at varying temperatures and strain rates on an AG 250KNE electronic tensile testing machine. The superplastic behaviours of the plates were also tested. A cavity-growth model was established and the changing laws of energy during cavity growth and microstructure evolution
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A note on mixed-mode fracture by the smoothing gradient damage model Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-02-23 Tinh Quoc Bui, Chanh Dinh Vuong
ABSTRACT The objective of this technical note is to illustrate twofold. The first issue is devoted to the ability of the recently developed smoothing gradient-enhanced damage model (SGDM), which is associated with the modified von Mises equivalent strain in modelling mixed-mode fracture problems, in particular the common Nooru–Mohamed's test. We show that the developed approach works pretty well for
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Nanomechanical properties of a nickel-base single-crystal superalloy up to 700°C Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-11-22 Bensheng Wei, Longfei Zhang, Lan Huang, Kechao Zhou, Zaiwang Huang
ABSTRACT A strong temperature-dependent effect in the range from 25°C to 700°C in the nanomechanical behaviour has been found in a single-crystal nickel-base superalloy. The hardness of this alloy gradually increases from 25°C to 400°C and then rapidly decreases, in contrast to the peak tensile yield strength which occurs at around 700°C. The nanomechanical response is strongly dependent on the indentation
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Degradation caused by self-multiplication of damage induced by an interplay between hydrogen and the martensite transformation in a Ni–Ti superelastic alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-12-22 Naoya Yamaguchi, Ken’ichi Yokoyama
ABSTRACT The role of damage in the degradation of tensile properties related to a stress-induced martensite transformation in a hydrogen-charged Ni–Ti superelastic alloy has been investigated. By damage, we mean vacancy clusters and dislocation structures induced in advance by a dynamic interplay between hydrogen and the martensite transformation. To homogenise the hydrogen concentration, the specimen
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Alignment and strengthening effect of β′ precipitates in Mg-Gd-Y-Zr during ageing process studied by HAADF-STEM and GPA Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-12-29 Chenyang Zhu, Jingxu Zheng, Xiaoqin Zeng, Bin Chen
ABSTRACT In the present study, the structural evolution of the precipitates in Mg-Gd-Y-Zr alloy is investigated by means of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The linearly aligned morphology of β′ phases connected by bridging βM phase in one of the three equivalent crystal directions of [101¯0] is formed from defect-free randomly distributed β′phases
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Experimental determination of effective atomic radii of constituent elements in CrMnFeCoNi high-entropy alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-01-25 Takeshi Teramoto, Momoko Narasaki, Katsushi Tanaka
ABSTRACT To elucidate the complex mechanism of solid-solution strengthening in high-entropy alloys (HEAs), it is necessary to determine the effective atomic radii of the constituent elements that are the sources of lattice strain. In the present study, the effective atomic radii of the constituent elements in CrMnFeCoNi HEA that are the basis of the atomic displacements, are evaluated from lattice
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Abnormal precipitation behaviour of α″-martensite from α-phase under tension–torsion deformation Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-01-12 Siqian Zhang, Liangzi Huo, Lijia Chen
ABSTRACT The tension–torsion properties and deformation microstructure of near β titanium alloy after various heat treatment have been investigated by transmission electron microscopy (TEM). The samples after aging treatment at 500°C for 8 h possesses obviously higher strength than those samples undergoing other different treatment on account of thin α” plates distributing uniformly in the β grains
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Effect of Cu content on hot-crack resistance of Al-Cu-Mg alloys produced by laser powder bed fusion Philos. Mag. Lett. (IF 1.2) Pub Date : 2022-01-12 Filippo Belelli, Riccardo Casati, Maurizio Vedani
ABSTRACT The lack of high-strength Al alloys that can be processed by laser powder bed fusion (LPBF) without formation of cracks is considered as one of the main issues for a wider diffusion of this technology in many fields. In this study, the effect of Cu content on the hot-crack resistance of Al-Cu-Mg alloys produced by LPBF was investigated. Powder batches with different compositions were produced
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An angular dislocation in an anisotropic medium Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-11-30 Roland Bonnet, Salem Neily
ABSTRACT The elastic field of an angular dislocation determined by Yoffe ([The angular dislocation. Phil. Mag. 5(50) (1960), pp. 161–175]) using isotropic elasticity is a convenient tool for modelling defects in very different materials such as crystalline media or the Earth’s crust deformed by internal shifts. We show that the anisotropy of the medium can be introduced in two ways to solve the same
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Correlation between bulk and precipitate composition in Al-Zn-Mg-Cu alloys Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-11-11 Yan Zou, Xiaodong Wu, Songbai Tang, Qianqian Zhu, Hui Song, Mingxing Guo, Lingfei Cao
ABSTRACT The composition of precipitates in peak-aged Al-Zn-Mg-Cu alloys with various Zn/Mg ratios has been investigated by atom probe tomography (APT). The results show that the η′ and the T′ phases have different compositions with a similar Zn/Mg ratio in the same alloy. The Zn/Mg ratio within precipitates was shown to be positively correlated with the Zn/Mg ratio in the alloy. Moreover, the size
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Criteria for laves-phase formation in refractory high-entropy alloys Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-11-11 Hongwei Yao, Dongxu Qiao, Junwei Miao, Jun Wang, Enyu Guo, Yiping Lu
ABSTRACT The refractory high-entropy alloys (RHEAs) have been the subject of considerable research in recent years. Since the Laves phase usually leads to a dramatic decrease in the malleability of RHEAs at ambient temperatures, it is critical to identifying the Laves-phase formation. Here, a facile and effective criterion is proposed to predict the phase stability based on the empirical parameters
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The micro- to nano-scale dislocation mechanics of (001) MgO crystal hardness Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-09-10 R. W. Armstrong, W. L. Elban
ABSTRACT Micro- to nano-indentation hardness-based stress–strain computations made for Berkovich spherically-tipped impressions put into (001) MgO crystal surfaces show an exceptional plastic strain hardening that is attributed to reacted sessile-type <110> Burgers vector dislocations. Additional evidence for the substantial strain hardening is provided in a compilation of Knoop hardness measurements
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Synthesis and characterisation of nanosized spinel particles of nickel-doped iron chromite Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-09-22 Malika Rani, Kiran Batool, Ayesha Younus, Atta Ullah Shah, Arshad Mehmood, Rubia Shafique, Shamim Khan, G. Murtaza, R. Neffati
ABSTRACT Nanoparticles of nickel-doped iron chromite (Fe1-xNixCr2O4) with composition x = 0.2-0.8 have been prepared by the sol–gel method using citric acid as a complexing agent. X-ray diffraction (XRD) results show that the synthesised doped nanoparticles are crystalline. Temperature and concentrations are key variables that influence nanopowder properties. To obtain fine powders, the doped samples
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Study of desirable precipitate-strengthening effects on friction-stir welded joints of third-generation Al–Cu–Li alloys Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-09-29 Dongyao Wang, Lihua Zhan, Quanqing Zeng, Diqiu He, Kefu Gan
ABSTRACT A friction-stir welded Al–Cu–Li alloy plate with desirable mechanical performance has been obtained using specific parameters. The microstructures of the nugget zone were systematically characterised and nano-sized phases, including δ′, θ′ and T1 were found in its matrix. These phases enhance the strength of the joint to a level comparable with the base metal. The results provide the means
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Preparation and study of cerium lanthanum zirconate fibres Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-11-03 Jianing Wang, Chaohui Wang, Qingke Li, Guangshu Li, Chunqi Wang, You Wang, Meiling Dong
ABSTRACT LZ7C3 fibres with nanostructures have been synthesised by the sol–gel method combined with electrostatic spinning technology and a high-temperature-resistant LZ7C3 ceramic material prepared by high-temperature calcination. The formation process of the ceramic fibre was studied and its properties characterized by differential thermal analysis, X-ray diffraction and infrared spectroscopy. The
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In situ change of fractal structure in coal with coking capability during high-temperature carbonisation Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-10-29 Yuexiang Wang, Zhihong Li, Jiao Kong, Liping Chang, Yixin Zhao, Lili Dong, Baoliang Lv
ABSTRACT Coal is an important energy and chemical raw material. Carbonization is an effective way for comprehensive utilization of coal, especially for coal with coking capability. The complex pore structure of raw coal and its carbonization solid products can be well characterized by a fractal description. Owing to a lack of in situ studies, the change in the fractal structure of coal with coking
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Criticism Of the paper titled ‘Solidification thermal parameters, microstructural evolution and dendritic growth in an AlCuNi alloy’ by Correa et al. Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-10-29 Murat Tiryakioğlu, Güven Kurtuldu
(2022). Criticism Of the paper titled ‘Solidification thermal parameters, microstructural evolution and dendritic growth in an AlCuNi alloy’ by Correa et al. Philosophical Magazine Letters: Vol. 102, No. 1, pp. 35-39.
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Microstructural evolution and grain-growth kinetics of Al0.2CoCrFeNi high-entropy alloy Philos. Mag. Lett. (IF 1.2) Pub Date : 2021-09-29 Srinivas Dudala, Chenna Krishna S, Rajesh Korla
ABSTRACT Grain-growth kinetics of high-entropy, single-phase, face-centred cubic (FCC) Al0.2CoCrFeNi alloy was studied by isothermal annealing over a wide temperature range for different time intervals. Both optical and EBSD studies show a significant amount of annealing twins. Data were analysed using classical grain-growth models and the activation energy was estimated using the Arrhenius type equation