About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Three-dimensional Faceted Boundaries of Different Twin Modes in hcp Metals |
Author(s) |
Shujuan Wang, Khanh Dang, Rodney James McCabe, Laurent Capolungo, Carlos Tome |
On-Site Speaker (Planned) |
Shujuan Wang |
Abstract Scope |
In hcp metals, deformation twinning is a major mechanism of shear accommodation. Tensile loading along the c-axis or effective compression perpendicular to the c-axis generally trigger {1012}<1011> and/or {1021}<1126> tensile twins, while compression parallel to the c-axis usually enables {1122}<1123> and/or {1011}<1012> compression twins. The nucleation and growth of these twins are controlled by the three dimensional (3D) faceted structures of their boundaries. We characterized the 3D faceted boundaries of {1012} in Mg and Ti and {1122} twins in Ti at the atomic scale using high-resolution transmission electron microscopy (HRTEM). We find eight characteristic facets in both {1012} and {1122} twin boundaries five and six of which have not been observed before, respectively. Implications of the observed facet structures towards the activation barriers and mobility of these facets will be discussed. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |