Showing papers in "Acta Materialia in 2023"

TL;DR: In this article , the authors proposed a strategy to design lightweight, strong, and high thermal-stable EHEAs by introducing an extremely stable Heusler-type ordered phase (L21 phase) containing a high-content of low-density elements and constructing a low lattice misfit eutectic-phase interface, which can lead to generate ultrafine and stable lamellar structures and high density of coherent nanoprecipitates.

TL;DR: In this paper , a combined experimental and theoretical investigation has been conducted in detail for rare earth (RE) compounds with regard to their structural and magnetic properties, particularly the magnetocaloric effect and magnetic phase transition (MPT).

TL;DR: In this paper , a network of segregation phases was proposed to alleviate thermal stress and eliminate hot cracking in the Ni11Zr9 network layer of a Ni-Ni-Ni alloy.

TL;DR: In this paper , the phase stability and mechanical properties of refractory high-entropy alloys (RHEAs) were tailored via the calculation of phase diagrams (CALPHAD) approach.

TL;DR: In this paper , the gradient distribution of plastic strain in a representative GNS metal of gradient nanotwinned (GNT) Cu was analyzed and coupled experimental and modeling characterization of gradient plastic deformation provided an in-depth mechanistic understanding of the spatial-temporal evolution of gradient strengthening effects in gradient nanostructures.

TL;DR: In this paper , the authors explored a strategy of using a heterogeneous grain size structure and a reduced stacking fault energy in a CoCrFeNiMn FCC high entropy alloy to overcome the limitations of the strength-ductility trade-off.

TL;DR: In this paper , the authors developed a novel strategy that utilizes displacive transformation and heterogeneous structures to mitigate the embrittlement of sigma phase particles in high-entropy alloys (HEAs).

TL;DR: In this article , the atomistic to micro-scale mechanisms of metal carbide decomposition were investigated through transmission electron microscopy and atomistic simulation, and it was shown that metal carbides can deform plastically during high-temperature creep, which is supported by the observation of high-density dislocations within MC and steps at matrix/MC interfaces.

TL;DR: In this paper , a quasi-trivalent dual-main-phase (Nd, Ce)-Fe-B magnets (DMP Ce magnets) using the strategy of two main phases with giant magnetic anisotropy energy gap (MAEG) was proposed.

TL;DR: In this paper , the substructures and crystallographic features of as-quenched lath martensite in interstitial-free (IF) steel and low-carbon steel (0.2C steel) were investigated using focused ion beam-scanning electron microscopy serial sectioning and advanced transmission electron microscope.

TL;DR: Zr/Nb6 multilayers of 6 nm periodicity, with well-composition-modulated structures, were prepared by magnetron sputtering and their microstructure and scratch properties were investigated using HAADF-STEM, XRD, AFM, and triboindenter as discussed by the authors .

TL;DR: In this article , the authors conducted in-situ tensile straining and post-mortem electron microscopy characterization, and atomistic density functional theory simulation to understand the RT superplasticity of an Al-15 Zn (at%) alloy.

TL;DR: In this article , the authors investigated the functional behavior of nanocrystalline NiTi shape memory wires having various austenitic microstructures and found that no plastic strains and lattice defects are generated by martensitic transformation proceeding in the absence of external stress, and plastic strains generated while the wire shortens during reverse transformation upon heating are significantly larger than plastic strain generated while it elongates upon forward transformation on cooling.

TL;DR: In this article , a new class of non-equiatomic NbTaTi-based RHEAs that can be cold-rolled to a reduction of over 90% from the as-cast state without surface treatment and/or intermediate annealing is reported.

TL;DR: In this paper , a large-scale experimental data and machine learning dataset was used to develop composition-property models for twenty five properties, which are interpreted using game-theoretic concepts.

TL;DR: In this paper , two means of tensile strain and charge doping are explored to obtain spontaneous valley polarization by regulating ferrovalley property and the direction of magnetization axis in monolayer ScBr2 and ScI2.

TL;DR: In this article , the effect of ion-irradiation-induced changes in structure, elastic properties, and thermal stability of metastable c-(Ti,Al)N thin films synthesized by high-power pulsed magnetron sputtering (HPPMS) and cathodic arc deposition (CAD) are systematically investigated by experiments and density functional theory (DFT) simulations.

TL;DR: In this paper , the authors proposed a strategy to simultaneously produce deformation twins and 9R structure in an Al-Mg alloy by nanostructuring grain sizes and alloying with Y. They demonstrated that plastic deformation of the nanograined Y-doped Al Mg alloy can concurrently drive the dissociation of incoherent twin boundaries and direct emission of grain boundary Shockley partial dislocations.

TL;DR: In this paper , the use of scanning electron diffraction coupled with electron atomic pair distribution function analysis (ePDF) was explored to understand the local order as a function of position in a complex multicomponent system, a hot rolled, Ni-encapsulated, Zr$ 65}$Cu$ 17.5}$ bulk metallic glass (BMG), with a spatial resolution of 3 nm.

TL;DR: In this paper , a diffraction line profile analysis correlated the faulting-embedded crystal structure to the dislocation density, stacking/twin fault probability, and stacking fault energy as a function of strain.

TL;DR: In this paper , high-angular resolution electron backscatter diffraction was performed to detect misorientation between the matrices on either side of the kink bands, and the misorientations corresponded to the magnitudes of the Frank vectors of the disclinations around a kink and closely matched the estimations from geometric analysis, which supported the existence of disclinations.

TL;DR: In this article , a detailed characterization of the main crack initiation sites was carried out to identify microstructural configurations governing crack nucleation in low-cycle dwell-fatigue, lowcycle fatigue and high-cycle fatigue regimes.

TL;DR: In this paper , textured nanocrystalline SmCo5-Cu magnets are produced by high pressure torsion (HPT) of powder blends consisting of smCo5 and Cu powder.

TL;DR: In this article , a linear-in-descriptor machine learning potentials is used to match dislocation migration pathways while keeping at least the elastic properties constant, allowing dislocations to cross the ab initio boundary in fully three dimensional defect geometries.

TL;DR: In this paper , a generalized application of first-order reversal curves analysis for the first time was applied to the characterization of soft magnetic iron composites by insulating spinel ferrite, which has been proven as a powerful avenue for enhancing the interparticle coupling while suppressing eddy currents.

TL;DR: In this article , the authors demonstrate in TiCoSb half Heusler compounds that Fe-dopants segregate to grain boundaries and simultaneously increase the electrical conductivity and reduce the thermal conductivity.

TL;DR: In this article , a new mechanism for the enhanced radiation resistance in HEA with the unusual interaction between HEA and He is found, where, differing from traditional metal, bubble growth leads to non-directional emission of interstitial atoms while HEA greatly suppress the growth of He bubbles.

TL;DR: In this paper , the tensile properties and deformation mechanisms at 293 and 77 K of single-phase face-centered-cubic (FCC) CrxMn20Fe20Co20Ni40-x (0 ≤ x ≤ 26 at.%) high-entropy alloys with grain sizes in the range [6-283 µm] were studied.

TL;DR: In this paper , a quantitative modeling of Ni coarsening in Ni-Yttria stabilized zirconia (YSZ) electrodes was achieved through three-dimensional (3D) phase-field simulation supported by ex-situ ptychographic nano-tomography and input of reliable thermophysical parameters.

TL;DR: In this article , a unique oxygen-gradient in pure Ti was designed, achieving a nontrivial combination of ultra-hardenability, high strength, toughness, and enhanced strain hardening rate.