| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Stress State Dependence of Basal-prismatic Facet Structures in Mg |
| Author(s) |
Khanh Dang, Shujuan Wang, Mingyu Gong, Carlos N. Tomé, Rodney J. McCabe, Jian Wang, Laurent Capolungo |
| On-Site Speaker (Planned) |
Khanh Dang |
| Abstract Scope |
Recent efforts to characterize the 3D structure of the {101 ̅2}<1 ̅011> twins have shown that the twin domains is are surrounded by multiple facets such as: coherent twin boundary (CTB), basal-prismatic (BP), twist pyramidal-pyramidal, and twist prismatic-prismatic. Among them, the BP facet has gained significant attentions due to its low formation energy and its role in the twin nucleation and growth. In this work, we report the formation of long and straight semi-coherent BP facets from short coherent ones during relaxation using a combined technique of high-resolution transmission electron microscopy (HRTEM) and molecular dynamics (MD) simulations. Moreover, due to its low mobility, this semi-coherent facet prevents the twin from collapse in the absence of an applied shear stress. The transformation is also reversed once the twin is reloaded. Importantly, this transformation indicates that the final BP configuration observed in HRTEM is not necessary the one activated during twin growth. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |