| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Effect of Slip and Twinning Microstructure on High Pressure Phase Transformation in Zirconium |
| Author(s) |
Arul Kumar Mariyappan, Yanbin Wang, Rodney McCabe, Laurent Capolungo, Carlos Tome |
| On-Site Speaker (Planned) |
Arul Kumar Mariyappan |
| Abstract Scope |
Group IV transition metal zirconium has a stable hexagonal-close-packed crystal structure (α) at ambient condition, and transforms to simple-hexagonal crystal structure (ω) under high pressure. The ω-phase is brittle compared to α-phase, and so the understanding of α-to-ω phase transformation is important to enhance the applicability of zirconium. The role of microstructure on this phase transformation is not understood yet. In this work, we study the effect of pre-existing slip and twinning microstructure on α-to-ω phase transformation and the stability of ω-phase using in-situ diffraction experiments at high pressure. The experiment reveals that pre-existing prismatic slip and tensile twinning microstructures favor the forward phase transformation when pressure is applied, and stabilizes the ω-phase when pressure is removed. On the other hand, pre-existing pyramidal slip and compression twinning microstructures delay the forward phase transformation under hydrostatic pressure and also mostly reverses back to α-phase upon pressure release. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Characterization, Other |