Mechanistic Transition from Screw to Edge Dislocation Glide Enhances High-Temperature Strength in Refractory Complex Concentrated Alloys
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arXiv
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866909901084688384 |
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| author | Zakia, Tamanna Nahin, Ayeman Yu, Dunji Pustelnik, Jacob Li, Juntan Kincheloe, Mason Amalia, Lia Chen, Yan Liaw, Peter K. Xu, Haixuan Zhang, Mingwei |
| author_facet | Zakia, Tamanna Nahin, Ayeman Yu, Dunji Pustelnik, Jacob Li, Juntan Kincheloe, Mason Amalia, Lia Chen, Yan Liaw, Peter K. Xu, Haixuan Zhang, Mingwei |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_10869 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Mechanistic Transition from Screw to Edge Dislocation Glide Enhances High-Temperature Strength in Refractory Complex Concentrated Alloys Zakia, Tamanna Nahin, Ayeman Yu, Dunji Pustelnik, Jacob Li, Juntan Kincheloe, Mason Amalia, Lia Chen, Yan Liaw, Peter K. Xu, Haixuan Zhang, Mingwei Materials Science 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. |
| title | Mechanistic Transition from Screw to Edge Dislocation Glide Enhances High-Temperature Strength in Refractory Complex Concentrated Alloys |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.10869 |