Showing papers in "Acta Materialia in 2013"

TL;DR: In this article, an equiatomic CoCrFeMnNi high-entropy alloy, which crystallizes in the face-centered cubic (fcc) crystal structure, was produced by arc melting and drop casting.

TL;DR: In this paper, the complexity and variety of fundamental phenomena in this material system with a focus on phase transformations and mechanical behaviour are discussed. And the challenges that lie ahead in achieving these goals are delineated.

TL;DR: In this article, the three major materials challenges for the current and next generation of water-cooled fission reactors are centered on two structural materials aging degradation issues (corrosion and stress corrosion cracking of structural materials and neutron-induced embrittlement of reactor pressure vessels), along with improved fuel system reliability and accident tolerance issues.

TL;DR: A brief overview of the available SPD technologies is given in this paper, along with a summary of unusual mechanical, physical and other properties achievable by SPD processing, as well as the challenges this research is facing, some of them generic and some specific to the nanoSPD area.

TL;DR: In this paper, the high thermal gradients occurring during SLM lead to a very fine microstructure with submicron-sized cells, which can be modified to a weak cube texture along the building and scanning directions when a rotation of 90° of the scanning vectors within or between the layers is applied.

TL;DR: In this article, the diffusion couple method was used to measure the diffusion parameters of Co, Cr, Fe, Mn and Ni in ideal-solution-like Co-Cr-Fe-Mn-Ni alloys.

TL;DR: In this paper, the authors evaluate the usefulness of configurational entropy as a predictor of single-phase stability in equiatomic, quinary alloys by replacing individual elements one at a time in a CoCrFeMnNi alloy.

TL;DR: In this article, the basic mechanisms of texture formation of aluminum and magnesium alloys during wrought processing are described and the major aspects and differences in deformation and recrystallization mechanisms are discussed.

TL;DR: In this article, the development of solid electrolytes and their application to solid-state lithium batteries are reviewed and a review of the advantages and disadvantages of these electrolytes are discussed.

TL;DR: In this paper, a survey of amorphous and nanocrystalline alloys for soft magnetic applications is presented, starting from the technique of production and including the key factors that determine their properties.

TL;DR: In this article, an overview of the more recent developments in this field, with special emphasis on the opportunities for achieving homogeneity in the as-processed materials and on the general characteristics of the mechanical properties achieved after SPD processing.

TL;DR: In this paper, the authors investigated the impact of the morphological and crystallographic texture on the competitive growth of selective laser melting (SLM) of a metal powder with a preferential crystal orientation along the building direction.

TL;DR: In this paper, the crystal structure, microstructure, density and Vickers hardness of four multi-principal element alloys, NbTiVZr, CrNbTiZr and NbVZR, are reported.

TL;DR: In this paper, three-dimensional atom-probe tomography studies demonstrate that the distribution of Al is highly inhomogeneous in the sintered bulk samples, and Al-containing precipitates including Al(Cu,Zn)−O−N, Al-O-N and Al−N are distributed in the matrix.

TL;DR: In this paper, a multiscale dislocation density-based constitutive model for the strain-hardening behavior in twinning-induced plasticity (TWIP) steels is presented.

TL;DR: In this paper, a metastable β Ti-12 wt.% Mo alloy was investigated in situ synchrotron X-ray diffraction, electron backscatter diffraction and transmission electron microscopy observations to investigate the deformation mechanisms and microstructure evolution sequence.

TL;DR: In this article, a review of the unique polarization anisotropy in gallium nitride (GaN) is included for the different crystal orientations, highlighting high power violet and blue emitters, and the effects of indium incorporation and well width.

TL;DR: In this paper, the impact of the Cu/Li ratio on the sequence and kinetics of solid-state precipitation is studied for two recently developed Al-Cu-Li-Mg-Ag alloys: AA2198 and AA2196.

TL;DR: In this paper, a detailed review of nanodimensioned materials has been provided which serves to update progress made along these lines, and highlights trends suggesting directions for future progress.

TL;DR: In this paper, anisotropic plastic deformation in columnar-grained copper in which preferentially oriented nanoscale twins are embedded is studied by experimental testing, crystal plasticity modeling and molecular dynamics simulations.

TL;DR: In this article, an instrumented nanoindentation was conducted on a FeCoCrMnNi high-entropy alloy with a single face-centered cubic structure to characterize the nature of incipient plasticity.

TL;DR: In this paper, the twin growth evolution in two grains with roughly the same high Schmid factors for twinning was analyzed and it was shown that the twin thickening rate was higher in the predominant twinning condition, but the nucleation rate was substantially faster in the two variant twinning conditions, while the overall volume fraction of twins was approximately the same in both grains, despite the difference in twin microstructure.

TL;DR: In this article, a phase field model was proposed to predict the kinetics of phase transformation at segregation decorated grain boundaries, showing that strong interface segregation of austenite stabilizing elements (here Mn) and the release of elastic stresses from the host martensite can generally promote phase transformation.

TL;DR: In this article, the grain boundary diffusion process using an Nd70Cu30 eutectic alloy has been applied to hot-deformed anisotropic Nd-Fe-B magnets, resulting in a substantial enhancement of coercivity, at the expense of remanence.

TL;DR: In contrast to the well-established recycling of metallic scrap, it is much more complicated to recycle electronics products which have reached the end of their life as they contain many different types of material types integrated into each other.

TL;DR: In this article, the mechanism of the coercivity enhancement by the grain boundary diffusion process (GBDP) using Dy vapor based on detailed microstructural characterizations was discussed, and it was shown that both the (Nd,Dy) 2 Fe 14 B shell and the Nd-rich GB phase layer are required micro-structural features for the GBDP.

TL;DR: In this paper, the evolution of dislocation storage in deformed copper was studied with cross-correlation-based high-resolution electron backscatter diffraction, and the average dislocation density increases with imposed macroscopic strain in accord with Ashby's theory of work hardening.

TL;DR: The present review looks at the advances in the bioceramic drug delivery systems, as well as those nanoceramics intended for specific and controlled drug release.

TL;DR: In this article, a regular nanocrystalline solution model was developed to identify the conditions under which binary nanocrystine alloy systems with positive heats of mixing are stable with respect to both grain growth and phase separation.

TL;DR: In this article, a slip-induced lattice rotation and determination of its rotation axis (Taylor axis) is used to determine the dominant slip mode in a grain that is deformed by matching the Taylor axis for a given slip system to its experimentally obtained IGMA distribution.