|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Deformation Modes in High-pressure ω-phase of Zr: A First-principles Study
||Anil Kumar, M. Arul Kumar, Irene J Beyerlein
|On-Site Speaker (Planned)
The phase diagram of Zr as function of temperature and pressure has been the subject of much research due to its excellent corrosion resistance and hence makes it attractive for aggressive environments such as nuclear reactors. Knowledge of the dominant plastic deformation modes in the high-pressure phase of Zr (ω-phase) is important for understanding the plasticity of this system; however, they have yet to be clarified. In this work, we use first-principles DFT calculations to determine the generalized stacking fault energy surfaces for the possible slip systems in the ω-phase of Zr to identify the dominant slip modes. We employ an effective medium visco-plastic self-consistent model to simulate the deformation texture using these slip modes. We show that they compare well with experimental deformation textures of ω-Zr. Our results are relevant to the (a) study plasticity of ω-Zr, and (b) for understanding the mechanisms underlying the α-ω phase transformation.
||Planned: Supplemental Proceedings volume