The spherical-like θ-Al45(Mn,Cr)7 particle having a monoclinic structure is observed in an Al–Mg alloy using TEM. Two types of twins with different twin directions are found in these θ-Al45(Mn,Cr)7 particles. One type is shown to be a (1‾11) twin with (1‾11) plane serving as the twinning plane and the shear direction is η1 = [12‾3]; the other type is seen to be a (1‾10) orientation twin with (1‾10)

Soft magnetic Co-based bulk metallic glasses (BMGs) with large supercooled liquid region (ΔTx) and high saturation magnetic flux density (Bs) have been developed in a new Co–Fe–Y–B alloy system. Addition of appropriate contents of Y and Fe into a Co75B25 alloy enlarges the ΔTx and improves the glass-forming ability (GFA). ΔTx of 50–64 K and a critical diameter of up to 2.0 mm have been achieved for

Microstructure evolution, dynamic recrystallization (DRX) behavior and mechanical properties of Mg–6Zn–1Mn-xGd alloys (x = 0, 0.2, 1.0 and 3.0 wt%) were investigated. The results showed that the phase components of as-cast Mg–6Zn–1Mn alloy were comprised of Mg7Zn3, α-Mn and α-Mg, while Mg3Zn6Gd (I phase) and Mg3Zn3Gd2 (W phase) were detected with the addition of Gd. Gd addition led to finer recrystallized

Fe-based amorphous alloys are characteristic of high saturation magnetization, low coercivity, and low core loss, which holds a grand promise for several engineering applications, such as soft magnetic, corrosion-resistant and wear-resistant coatings. However, poor amorphous forming ability (AFA) and size limit remain the main obstacles in applications. This study aims to address those scientific-technical

Structural characterization (differential scanning calorimetry, DSC, and X-ray diffraction, XRD) and temperature dependence of the magnetization are reported in Ni80Si10B10 and Ni75Si15B10 alloy ribbons produced by rapid solidification. XDR and DSC measurements lead to confirm the amorphous character of Ni75Si15B10 alloy while the Ni80Si10B10 alloy presents a mixture of amorphous and crystalline (Nickel

The fracture behaviors of tungsten inert gas (TIG) welded titanium alloy TA15 subjected to tensile and fatigue loadings were investigated. Using the staircase test method, the fatigue probabilistic S-N (P-S-N) curves of the titanium alloy were obtained. Electron back scattered diffraction (EBSD) and Scanning electron microscope (SEM) were utilized to study fracture mechanism. The results showed that

The transition behavior of coarse AlN during cold rolling in the low-temperature grain-oriented silicon steel normalized sheet was investigated using field emission scanning electron microscopy (SEM) and field emission transmission electron microscopy (TEM). The SEM observation results showed that the size of AlN decreased with the increase of the cold rolling reduction rate, and the average sizes

CoCrFeNiMn high-entropy alloy (HEA) coatings were deposited on 316L stainless steel substrate by detonation spraying technique. The HEA coatings had a dense microstructure and contained a small amount of flocculent metal oxides, showing a main face-centered-cubic (FCC) solid solution structural matrix with amounts of nano-multi-component metal oxides. It was found that the microhardness of CoCrFeNiMn

In this paper, Wf/La62Al14Cu12Ni12 bulk metallic glass composites (BMGCs) were successfully prepared by a new forward melt infiltrating method. Compared with Wf/Zr-based BMGCs, the preparation of Wf/La62Al14Cu12Ni12 BMGCs is simpler and more convenient. In the experimental part, quasi-static compressive behaviors of composites with different fiber volume fractions were systematically investigated.

The L12 nanoparticles-enhanced alloys have huge potential in high temperature applications. In this study, the effects of Cr content on precipitation behaviors of (CoCrNi)94Ti3Al3 medium entropy alloys are investigated. The results indicate the fraction of L12 phase increases with the rising Cr content, meanwhile, the size and coarsening rate of L12 phase decrease, which suppresses the overaged degradation

Two-phase (α2Ti3Al+γTiAl) fully lamellar TiAl alloys show highly anisotropic creep behaviour. Depending on lamellar orientations, locally in the TiAl phases hard and easy deformation modes are active, which significantly influence the creep behaviour at a global scale. To obtain comprehensive understanding how the locally activated crystallographic deformation modes influence the macroscopic creep

The deformation behavior of VCoNi medium-entropy alloy at the temperatures ranging from 77 K to 573 K was experimentally investigated in this study. It showed that the high-density nanosized dislocation substructures and deformation twins played a major role in the tensile deformation at 77 K, and their synergistic effects caused an excellent combination of strength and ductility. When the temperature

The effects of intermediate temperature aging on two-stage R-phase transformation behavior exhibited in Ti50-xNi48+xFe2 (x = 0.5 and 1.5) SMAs were investigated. In Ti48.5Ni49.5Fe2 SMA, no transformation occurred in the as solution-treated state, and B2↔R1 transformation was induced by Ti3Ni4 precipitates when the specimens were aged at 350 °C. When the specimens were aged at 450 °C, a two-stage R-phase

Magnetic properties of intermetallic MnMn0.25Sb crystallizing in the NiAs-type hexagonal structure are reported. A spin-glass transition at Tf ≈ 10.7 K was identified from Ac susceptibility measurements. The value of the Mydosh parameter (φ≈0.06). was further indicative of cluster spin glass like state. The frequency dependence of Tf was investigated by critical slowing-down model and Vogel-Fulcher

An extensive experimental investigation of Fe-based Heusler alloys has been performed in order to potentially prepare new materials which are tetragonally distorted and have large perpendicular magnetic anisotropy crucial not only for the STT-MRAM applications but also for magnetic shape memory devices. Based on criteria demanded for the MSM applications 25 Fe2YZ various compounds were selected for

GeTe-based alloys have been considered as p-type thermoelectric materials for decades. Yet the fact that they possess intrinsically high concentration of cation germanium vacancies have triggered the thermoelectric community in finding alternatives and strategies to optimize their efficiency. While most of the published studies mainly discuss the stoichiometric alloy, here we demonstrate the introduction

Equiatomic and near-equiatomic NiTinol alloys, mainly due to the exhibition of adjustable mechanical and thermal shape memory properties, are widely exploited to produce different smart and functional devices. Laser powder bed fusion technique was used in this research to process dense NiTinol parts from a prealloyed near-equiatomic NiTi powder, using three different volumetric energy densities. In

The addition of ternary alloying elements Cu and Fe on the hot workability of binary NiTi SMA is assessed using the processing maps approach. Uniaxial compression test data obtained in the temperature, T, range 800–1050 °C and strain rate, ε˙, of 10−3 – 10+1 s−1 were utilized to construct power dissipation, instability and strain rate sensitivity maps at true strain, ε = 0.5. These maps and complementary

Evolution of the as-solidified microstructures of Ti–45Al–8Nb, Ti–45Al–8Nb–2Cr-0.2B, Ti–45Al–8Nb–4Cr-0.2B alloys, and phase stability during high-temperature exposure (1000°, 1100°,1200 °C) have been analyzed in the present report. Macroscopic examinations of the as-cast pancakes indicate that Nb, Cr, and B alloying can be effectively utilized as potential grain/colony size refiners for Ti–45Al base

High entropy alloy (HEA) as coating material has more economical application value. In this study, CoCrFeNiTi HEA coating without cracks and pores was successfully prepared on 304 stainless steel substrate by laser cladding. The phase structure of the CoCrFeNiTi HEA coating was composed of main phase with an FCC lattice, Fe and Cr rich phase with an SC lattice and CoTi2 type Laves phase. The microstructure

In this work, we further analyze the promising magnetocaloric (NiMnSi)0.66(Fe2Ge)0.34 alloy, which presents isothermal entropy change values as large as 29 J kg−1 K−1 for 2 T at room temperature. It undergoes a magnetostructural transition accompanied by large thermal/magnetic hysteresis, which remains up to high magnetic fields (corroborated by the elaboration of an experimental magnetic phase diagram)

In this work, we proposed a process to improve the functional stability of Ni-rich NiTi alloys, which combines surface nano-crystallization by means of ultrasonic shot peening and subsequent low-temperature (523 K) aging treatment. The as-annealed coarse-grained NiTi plates were fist subjected to ultrasonic shot peening, which generates nano-grains at the surface region, and introduces dislocation

The atomic structure of the high-temperature β-Fe6Ga5 phase, formed in the Fe-45at.%Ga alloy during rapid cooling from the melt, has been refined by X-ray, neutron diffraction techniques, and density functional theory calculations. The regularities of the phase composition evolution of the quenched Fe-45at.%Ga alloy in the process of continuous slow heating and cooling under vacuum conditions have

Developing Fe-based amorphous alloys with high saturation flux density (Bs) have been challenging topics for a long time. Metalloid elements like B, Si, C, and P are key elements for Fe-based amorphous alloys, but the addition of multiple metalloids would significantly complicate the effects of each metalloid on saturation flux density. Herein, Fe83-85(B, C, Si)14–16P1 amorphous alloys with high Bs

As a common detrimental element in Al-Si cast alloy, Fe can be effectively removed by Fe-containing intermetallic separation in the alloy melt. However, the thermodynamic formation mechanism and growth morphology evolution of high separable Fe-containing intermetallic have not been investigated and clarified in detail until now. In this study, thermodynamic calculation, three-dimensional (3D) growth

Lightweight intermetallic γ-TiAl based alloys are innovative high-temperature structural materials. So far, these alloys are in use as turbine blades or turbocharger turbine wheels in advanced aerospace and automotive engines, where they are produced by means of investment casting as well as wrought processing, e.g. hot-forging. Through the development of powder-based additive manufacturing processes

Powder-in-tube (PIT) Nb3(Al1-xCux)(x = 0–0.04) superconducting wires were fabricated by rapid heating, quenching and transformation (RHQT) process. With the addition of Cu, disordered Nb3Al A15 phase with stoichiometric composition was formed in the quenched wires and atomic long range ordering occurred during the low temperature annealing process, resulting in improvement of Tc, Jc and Birr performance

Mn–Fe–P–Si compounds are promising magnetocaloric materials for magnetic refrigeration. However, the microstructure evolution and solidification characteristics are rarely discussed in the literature. Here, we investigate the solidification characteristics and microstructure evolution of MnFeP0·5Si0.5 alloys under different undercooling and cooling rates based on droplet melting method. Results show

In this work, Fe83+x(B4P8C4)16-xCu1 (x = 0, 1, 1.5 and 2 at. %) alloy system with amorphous/α-Fe hierarchic structures in as-cast state were artificially designed. The microstructure, crystallization kinetics, nanocrystalline structure, and magnetic properties of the alloys were systematically investigated. And the structural mechanism for the magnetic properties of these alloys was discussed. It is

The effects of Ni foam addition and solid-liquid electromigration on the bonding of Cu/Sn-3.0Ag-0.5Cu/Cu joints under condition of 320 °C for 2, 4 and 8 h with the electric densities of 0, 3.33 and 6.67 × 102 A/cm2 were investigated. The results indicated that intermetallic compounds (IMCs) performed non-interfacial growth in the Cu/Ni foam/SAC305 system and were distributed in an island-like aggregation

Fe−Ga alloys (Galfenols) are of interest due to their pronounced magnetostriction, whereby the mechanistic understanding is limited. By means of powder X-ray and neutron diffraction it is shown that as-cast Fe-38.4 at%Ga alloy consists of Fe13Ga9 intermetallic with a monoclinic Ni2In/NiAs-related structure, which coexists with bcc solid solution. By means of electron backscatter diffraction it is shown

We investigated the strain modulation of the magnetic states and interatomic exchange interactions in layered van der Waals magnet Fe3GeTe2 by detailed first-principles studies. The energy-minimum calculations demonstrate the ground state of bulk Fe3GeTe2 is weak antiferromagnetic coupling, in contrast to most precious reports, and it can be modulated to ferromagnetic coupling under small a-axis distortion

The solid-liquid equilibria in the system Sn–Zr were investigated experimentally by using the spot technique (thermo-optometry based technique) and differential thermal analysis. The liquidus in the composition range 0–80 at.% Zr was experimentally established. The solidus-liquidus in the composition range 80–100 at.% Zr and all other invariant equilibria have also been re-established. The temperature

A seven-component (FeCo)xBSiVCuY amorphous/nanocrystalline alloy system with high ferromagnetic element contents (x = 85, 86 and 87, at atomic percent) was synthesized by rapid quenching method. The microstructure, crystal structure, magnetic property and crystallization behavior were systematically investigated. It is found that the highest saturation magnetization of these as-cast ribbons reaches

The distribution tendency of the alloying elements in the body-centered cubic (bcc) Fe/B2–NiAl interface is of fundamental importance for understanding the nucleation and morphology of NiAl precipitates during the aging process of the B2–NiAl precipitation strengthened maraging steels. In the present work, the first-principles density functional calculations have been used to perform an extensive investigation

In this work, near full density and crack-free hybrid aluminum matrix composites (HAMCs) reinforced with Cr3C2 ceramic particles and Ni–Cr trace elements were successfully fabricated by selective laser melting (SLM). The phase structure, microstructure, mechanical properties and strengthening mechanism of HAMCs were investigated. The results show that various intermetallic compounds, such as Al13Cr2

A comprehensive work has been carried out on the creep ageing behaviour of 2195-T84 Al–Li alloy under both tensile and compressive stresses at 180 °C for 16 h. The corresponding creep deformation and age hardening phenomena have been investigated by creep tests and uniaxial tensile tests. It has been found that the creep strains after tension creep tests are much larger than those after compression

The aluminum alloys joints welded by friction stir welding (FSW) are usually fractured in or near the thermo-mechanically affected zone (TMAZ) of the welded zone, and different microstructural zones produced by FSW affect the corrosion resistance of the joints. In the present work, we performed the research on local corrosion behavior of the TMAZ in dissimilar AA2024/7075 joints by employing multiple

Detailed knowledge about physical and chemical properties of the SrZn13 intermetallic compound is of technological importance in the design and manufacture of Sr-modified Zn-base alloys. The main objective of this study was to further knowledge of the mechanical and vibrational properties of the Al-incorporated Sr(Zn1−xAlx)13 compound. The Sr(Zn1−xAlx)13 was synthesized by melting down zinc ingots

In this study, we successfully synthesized TaNbHfZrTi high-entropy alloy (HEA) powders using a hydrogenation-dehydrogenation reaction and investigated their sintering behavior using a spark plasma sintering method. The initial ingot had a single solid solution body-centered cubic (BCC) phase, but after annealing in the hydrogen atmosphere, it absorbed hydrogen and transformed to a metal hydride phase

The effect of microstructural defects induced by mechanical milling has been studied in a Ni–Mn–In–Co metamagnetic shape memory alloy. The martensitic transformation and Curie temperatures do not change with grinding, thus pointing out to a null variation of long range atomic order as a consequence of the deformation. Nevertheless, the enthalpy change of the martensitic transformation highly decreases

Crystal structure and magnetic properties of the R11Co4In9 compounds (R = Tb–Er) have been investigated by means of X-ray diffraction as well as dc magnetic measurements. The compounds crystallize in the orthorhombic Nd11Pd4In9-type crystal structure (Cmmm space group) in which the rare earth atoms occupy five nonequivalent sublattices. Magnetic properties of the investigated compounds are related

In this study, we examined the microstructure, hydrogen absorption behavior, and native oxide layer of 20Ti–20Zr–20V–20Nb–20Cr high entropy alloy. It was revealed that the alloy consisted of two phases with the chemical composition of 31.1Ti-19.6Zr-16.6V-26.0Nb-6.7Cr (bright phase) and 9.1Ti-20.3Zr-23.4V-14.1Nb-33.1Cr (dark phase). Even though an oxide layer was formed on the surface of the alloy due

For in-situ Ti48Zr20Nb12Cu5Be15 metallic glass matrix composites (MGMCs) upon cold rolling, the yield strength is obviously enhanced, and the plasticity instability is effectively alleviated. The increase in yield strength in such kinds of composites is due to the fact that the work hardening of dendrites overwhelms the softening of the amorphous matrix. A quantitative model of predicting yield strengths