2025/11/14 by Tamanna Zakia, Ayeman Mazdi Nahin, Zakia, Tamanna +19
Engineering · Materials Science · #FOS: Physical sciences #High Temperature Alloys and Creep #Intermetallics and Advanced Alloy Properties #Materials Science (cond-mat.mtrl-sci) #Titanium Alloys Microstructure and Properties
paper · pdf · doi:10.48550/arxiv.2511.10869
openalex publication_date 2025/11/14 · openalex created_date 2025/11/18 · openalex updated_date 2026/07/28
The strength of body-centered cubic materials is traditionally known to be governed by screw dislocations. However, recent findings reveal that in certain refractory complex concentrated alloys, edge dislocations can instead control strength. This work integrates high-temperature mechanical testing, in-situ neutron scattering during heating and tension, scanning transmission electron microscopy, and molecular dynamics simulations to uncover the mechanism behind this behavior. In the Nb-Ta-Ti-V system, increasing the V content, due to its smaller atomic size, induces substantial atomic misfit that raises the glide barrier for edge dislocations relative to screw dislocations. This effect drives a gradual transition from screw to edge dislocation-controlled deformation, leading to markedly enhanced strength at elevated temperatures.