About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
|
| Presentation Title |
Unravelling the Temperature- and Composition-dependent Strengthening Mechanisms in Refractory Complex Concentrated Alloys |
| Author(s) |
Deva Prasaad Neelakandan, Kangjin Lee, Chia-Yi Wu, Chenyang Li, Yi-Chia Chou, Wei Chen, Ke An, Gian Song, Peter K Liaw, Chanho Lee |
| On-Site Speaker (Planned) |
Deva Prasaad Neelakandan |
| Abstract Scope |
This work aims to advance the fundamental understanding of deformation mechanisms in refractory complex concentrated alloys (RCCAs) across varying temperatures and compositions. The studied alloys span binary to quinary systems, each exhibiting unique local chemical environments and lattice distortion (LD), which significantly affect dislocation behavior. Through an integration of advanced experimental and theoretical modeling efforts, this study systematically explores the relationships among LD, dislocation dynamics, and mechanical properties. Notably, the results reveal that edge dislocations, traditionally considered less influential in BCC metals, play a dominant role in strengthening RCCAs at elevated temperatures. This behavior is attributed to strong solute-dislocation interactions and severe LD that effectively pin edge dislocations. The findings highlight the importance of temperature- and composition-dependent dislocation mechanisms in RCCAs and suggest that tailoring LD can provide new pathways for improving high-temperature strength. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Mechanical Properties |