About this Abstract |
Meeting |
5th International Congress on 3D Materials Science (3DMS 2021)
|
Symposium
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5th International Congress on 3D Materials Science (3DMS 2021)
|
Presentation Title |
Formation and Annihilation of Thin Twins in Hexagonal Close Packed Materials |
Author(s) |
Hamidreza Abdolvand, Karim Louca, Charles Mareau, Marta Majkut, Jon Wright |
On-Site Speaker (Planned) |
Hamidreza Abdolvand |
Abstract Scope |
Slip and twinning contribute significantly to plastic deformation in hexagonal close packed (HCP) materials. In this study, zirconium and magnesium specimens with HCP crystals are deformed in-situ to study formation and annihilation of twins using three-dimensional synchrotron X-ray diffraction. Methods are developed for accurate determination of grain properties, results of which are compared to those from electron backscatter diffraction measurements. New methods are developed to find the twins that form with loading and determine their corresponding parents. The measured initial microstructures are mapped into crystal plasticity models to study the evolution of grain resolved stresses. It is shown that twins are stressed when they are thin but relax with further loading. While a sign reversal is observed for the resolved shear stress (RSS) acting on the twin habit plane in the parent, the sign of RSS within the majority of twins stays unchanged until twin annihilation during the load reversal. |
Proceedings Inclusion? |
Definite: Other |