Role of face centered cubic/body centered cubic phase boundary crystallography on void growth
Not Available
Christodoulou, Paul G. (ORCID:0000000252595785)↗
Engineering topics
Beyerlein, Irene J. (ORCID:0000000254895132)
Publications and source records attributed to Beyerlein, Irene J. (ORCID:0000000254895132).
Role of temperature on screw dislocation dynamics in Ta, W, and Ta–W alloy
Not Available
36 MATERIALS SCIENCE↗
Deformation mechanisms and defect structures in Heusler intermetallic MnCu 2 Al
Not Available
Materials Science↗
Complex concentrated alloys and chemical short-range ordering
Abstract Complex concentrated alloys (CCAs) are materials comprising three or more elements in similar proportions and possessing structural but no chemical long-range order. Fascination with CCAs has grown over the last 20 years and to date, CCAs have opened a new materials design paradigm and horizon for discovery of materials to meet the demands of applications in aggressive environments. Understanding the fundamental mechanisms controlling their response, however, is challenging due to the chemical and structural variations that wildly fluctuate over fine atomic and nanoscales. This issue focuses on the experimental, computational, and theoretical investigations that aim to uncover phenomena and processes determining the structure, kinetics, mechanics, or deformation mechanisms in CCAs at the atomic scale. At the atomic scale at which they operate, chemical short-range ordering can be influential. This issue further addresses the capabilities, as well as the debatable need, to characterize, predict, and relate short-range ordering to material performance. Collectively, the articles in this issue highlight the insights, understanding, and experimental and computational tools that attempt to create property-tunable CCAs “from the atom up” by treating short-range ordering and engineering atomic-scale mechanisms. Graphical abstract
36 MATERIALS SCIENCE↗
Simultaneous high strength and mechanical stability of bcc Nb/Mg nanolaminates
Not Available
Jain, Manish (ORCID:0000000318831382)↗
Local hardening and asymmetric twin growth by twin-twin interactions in a Mg alloy
Not Available
36 MATERIALS SCIENCE↗
Critical Shape for the Growth of Grain Boundary Twin Embryos in Mg and Mg Alloys: Crystal Plasticity Modeling
Application of polycrystalline hexagonal close packed (HCP) metals in engineering designs has been constrained by their anisotropic responses due to twinning and limited plasticity. In deformation, twins most often initiate at grain boundaries (GBs), and thicken and propagate across the grain. In this work, the GB twin embryos in Mg and Mg alloys, and the conditions that influence their propagation are investigated. Using a micromechanical crystal plasticity model, the role of embryo shape on the driving forces prevailing at the embryo boundaries that could support its expansion is studied. The modeled embryos are either planar, extending more in the shear direction than normal to the twin plane, or equiaxed. Results show that the thinner the embryo, the greater the driving forces for both thickening and forward propagation. Alloys with low prismatic-to-basal critical resolved shear stress (CRSS) ratios promote embryo thickening and large CRSS values for the slip mode that primarily accommodates the twin shear encourage propagation. The neighboring grains with orientations that enable local accommodation of the embryo twin shear by pyramidal slip promote forward propagation but have little effect on thickening. When two like embryos lie along the same GB, their paired interaction promotes forward propagation but hinders thickening.
36 MATERIALS SCIENCE↗