Enhanced Elevated-Temperature Strength in Refractory Complex Concentrated Alloys via Temperature-Induced Transition from Screw-to-Edge Dislocation Control
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866910013443801088 |
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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 | Refractory complex concentrated alloys (RCCAs) show promise for high-temperature applications but often lose strength due to screw-dislocation-controlled plasticity. We demonstrate a temperature-driven transition from screw- to edge-dislocation-controlled deformation in a single-phase NbTaTiV RCCA. Tensile tests from 298-1573 K reveal a pronounced intermediate-temperature strength plateau and yield strengths surpassing other ductile RCCAs and the Ni-based superalloy CMSX-4 above 1273 K. In-situ neutron diffraction, TEM, and molecular dynamics identify a crossover near ~900 K, where edge dislocation glide stabilized by V-induced lattice distortion dominates, enabling enhanced strength retention and a clear design strategy for ultrahigh-temperature applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_06225 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Enhanced Elevated-Temperature Strength in Refractory Complex Concentrated Alloys via Temperature-Induced Transition from Screw-to-Edge Dislocation Control 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 Refractory complex concentrated alloys (RCCAs) show promise for high-temperature applications but often lose strength due to screw-dislocation-controlled plasticity. We demonstrate a temperature-driven transition from screw- to edge-dislocation-controlled deformation in a single-phase NbTaTiV RCCA. Tensile tests from 298-1573 K reveal a pronounced intermediate-temperature strength plateau and yield strengths surpassing other ductile RCCAs and the Ni-based superalloy CMSX-4 above 1273 K. In-situ neutron diffraction, TEM, and molecular dynamics identify a crossover near ~900 K, where edge dislocation glide stabilized by V-induced lattice distortion dominates, enabling enhanced strength retention and a clear design strategy for ultrahigh-temperature applications. |
| title | Enhanced Elevated-Temperature Strength in Refractory Complex Concentrated Alloys via Temperature-Induced Transition from Screw-to-Edge Dislocation Control |
| topic | Materials Science |
| url | https://arxiv.org/abs/2602.06225 |