About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Nix Award and Lecture Symposium: Recent Developments in Understanding Deformation Behavior and Mechanisms in Metals at High Temperature
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| Presentation Title |
Determination of the Deformation Mechanisms in Some Refractory Compositionally Complex Alloys by Application of Transmission Electron Microscopy, A Mike Mills Preferred Technique! |
| Author(s) |
Hamish L. Fraser |
| On-Site Speaker (Planned) |
Hamish L. Fraser |
| Abstract Scope |
The deformation behaviors of two distinct refractory compositionally complex alloys are compared. The first is a bcc alloy based on NbTiTaV, while the second based on the alloy system AlMoNbTaTiZr which in our case is a multi-phase alloy with a B2 matrix with bcc precipitates. In each case, the alloys have been deformed either in compression or by nano-indentation and the resulting deformation mechanisms have been determined by application of diffraction contrast experiments in the TEM. In the bcc phases of both alloys, deformation is accomplished by dislocation glide, where the Burgers vectors of the dislocations is given by b=, gliding on {110} and {112}; the B2 phase also deforms by dislocations with similar Burgers vectors, except they are present as dissociated super dislocations. To determine the character of the dislocations present, trace analyses based on stereographic techniques have been undertaken. The results of these studies will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, |