Showing papers in "Acta Materialia in 2022"

TL;DR: In this paper , a combined theoretical and experimental investigation of the crystal structure together with the magnetic properties, magnetic phase transition (MPT) and magnetocaloric (MC) effects of magnetic solids have been realized to be a promising energy efficiency and environmentally friendly technology.

TL;DR: In this paper , NiTi shape memory alloys were fabricated using laser powder bed fusion and consistently exhibited room temperature tensile superelasticity up to 6% in the as-printed condition.

TL;DR: In this article , the effects of structure relaxation and surface oxidation on the wear performance of MGs were investigated by using atomic force microscope (AFM) measurements to quantitatively clarify the effect of surface chemistry over structure modification during wear.

TL;DR: In this article , a high-entropy alloy with combined gradient distributions along the depth for both grain size and volume fraction of precipitates was designed and introduced in a high entropy alloy by surface mechanical attrition treatment and aging.

TL;DR: In this paper , the phase transformation sequence of Al-rich zone → θ (D03−Mg3Al) → AlLi was confirmed during anisothermal ageing, and a braided structure resulting from spinodal decomposition was found to be the optimized microstructure for achieving the peak strength.

TL;DR: In this article , a series of high quality rare earths (RE) based magnetic materials have been fabricated and a combination of theoretical and experimental investigation has been performed in terms of the crystal structure, electronic structure, magnetic properties and magnetic phase transition (MPT) as well as the magnetocaloric (MC) effect has been extensively investigated in various magnetic materials.

TL;DR: In this paper , a metalloid substitution is proposed to increase local lattice distortion and short-range chemical inhomogeneities to elevate strength, and in the meantime reduce the stacking fault energy to discourage dynamic recovery and encourage defect accumulation via partial-dislocation-mediated activities.

TL;DR: In this article , a peak-aged high-entropy alloy (HEA) system with a medium-to-high stacking fault energy (SFE) was shown to exhibit an anomalous precipitate-size-dependence of ductility.

TL;DR: In this paper, a peak-aged high-entropy alloy (HEA) system with a medium-to-high stacking fault energy (SFE) was shown to exhibit an anomalous precipitate-size-dependence of ductility.

TL;DR: In this article , a hierarchical microstructure modulation strategy was proposed to achieve an excellent combination of low-temperature ductility and high strength in bulk pure tungsten (W) powders.

TL;DR: In this paper , two new microstructures, named triple-phase triple-state (T-T) and triple phase dual-state structures, were developed using a two-step heat treatment process in the Ti-43.5Al-4Nb-1Mo-0.1B (TNM) alloy, which also contains the pearlitic-like microstructure (PM) transformed through triggering a massive cellular response (CR).

TL;DR: In this paper, a machine learning-based alloy design system (MADS) was presented to facilitate the rational design of high entropy alloys with enhanced hardness, and the best performer exhibits ultra-high hardness, which is 24.8% higher than the highest one.

TL;DR: In this paper , a machine learning-based alloy design system (MADS) is presented to facilitate the rational design of high entropy alloys with enhanced hardness, and the best performer exhibits ultra-high hardness, which is 24.8% higher than the highest one in the original dataset.

TL;DR: In this paper , a nanostructured Al-5Mg alloy with a high proportion of low angle grain boundary equiaxed grains were generated by dynamic plastic deformation and appropriate annealing treatment.

TL;DR: In this paper , a combination of high-density dislocation structures and high-volume-fraction ductile nano-precipitates in a high-entropy alloy (HEA) is presented.

TL;DR: In this article , a novel additively manufactured Al-10.5Ce-3.1Ni-1.2Mn wt.% alloy was reported to have excellent creep resistance relative to cast high-temperature aluminum alloys at 300-400 °C.

TL;DR: In this paper , a data-driven and machine learning assisted prediction and optimization strategy is proposed to explore the prototype FeCoNiCrMn HEAs with low hydrogen diffusion coefficients.

TL;DR: In this article , high pressure torsion deformation followed by appropriate annealing was performed on 316 stainless steel (SS) for the first time, achieving an unprecedentedly high yield strength (2.34 GPa) at the smallest grain size of 46 nm, in which dislocation scarcity induced hardening accounting for 57% of the strength.

TL;DR: In this paper , the tensile and compressive creep properties of a quaternary Al-Cu-Mn-Zr (ACMZ) alloy and its commercial counterpart, RR350, are investigated at 300° C.

TL;DR: In this paper , the stacking fault energy (SFE) was determined for 10 single-phase FCC CrxMn20Fe20Co20Ni40-x high-entropy alloys for 0 ≤ x ≤ 26 at.

TL;DR: In this paper, the authors present experimental evidence for chemical short-range order (CSRO) in high-entropy alloys (H/MEAs) from electron diffraction as well as atomic-resolution chemical mapping.

TL;DR: In this article , the authors present experimental evidence for the chemical short-range order (CSRO) in high-entropy alloys (H/MEAs) from electron diffraction as well as atomic-resolution chemical mapping.

TL;DR: In this article , an alloy design approach is used to isolate titanium alloy compositions for biocompatibility which exhibit a modulus of elasticity lower than the Ti-6Al-4V grade commonly employed for this application.

TL;DR: In this article , a high proportion of relaxed grain boundaries (GBs) were generated in an Al-5Mg alloy through emitting partial dislocations from GBs when grain sizes are below a critical value.

TL;DR: In this paper , a steel with high fracture toughness (129 MPa m½) in a high-strength (∼1.5 GPa yield strength) and ductile (37% uniform elongation) austenitic stainless steel was developed.

TL;DR: In this article , a series of Ag2Se/Carbon nanotubes (CNTs) nanocomposites are controllably constructed through in situ solution synthesis combined with fast sintering.

TL;DR: In this paper, a series of Ag2Se/Carbon nanotubes (CNTs) nanocomposites are controllably constructed through in situ solution synthesis combined with fast sintering.

TL;DR: In this article , the point defect properties of body-centered cubic medium-entropy alloy NbZrTi were studied by first-principles calculations and the effect of atomic composition and short-range order on elemental and total interstitial diffusion was also investigated.

TL;DR: In this paper, the authors compared the microstructure and the mechanical behavior of as-printed and stress-relieved Haynes 230 Ni alloys prepared by laser powder bed fusion.

TL;DR: In this paper , the authors compared the microstructure and the mechanical behavior of as-printed and stress-relieved Haynes 230 Ni alloys prepared by laser powder bed fusion.