About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
|
| Presentation Title |
Accurate Determination of the Deformation Mechanisms in Refractory Compositionally Complex Alloys |
| Author(s) |
Brian Welk, Paraic O'Kelly, Zachary Kloenne, Gopal Viswanathan, Hamish L. Fraser |
| On-Site Speaker (Planned) |
Hamish L. Fraser |
| Abstract Scope |
The deformation mechanisms active in two types of compositionally complex alloys (CCAs) will be described. The first of these is a single-phase bcc alloy, and the second consists of a two-phase mixture of an intermetallic compound (with the B2 crystal structure) as the matrix containing bcc precipitates. Regarding the first, diffraction contrast experiments in the TEM coupled with trace analyses have been used to show that deformation is controlled by dislocations near to screw character. In the second alloy, again detailed TEM contrast experiments and trace analyses have been used to show that dislocations glide relatively freely between the two phases. While the deformation behavior in the two-phase alloy is consistent with a ductile response to imposed deformation, the alloy exhibits rather limited ductility; this has been shown to be due to the brittle behavior of a second intermetallic phase present at sub-grain boundaries. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Mechanical Properties |