About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Magnesium Technology 2020
|
Presentation Title |
On the Influence of Twinning and Detwinning on the Deformation of Mg at the Micron Scale |
Author(s) |
Mohammadhadi Maghsoudi, Gyuseok Kim, Markus Ziehmer, Erica T. Lilleodden |
On-Site Speaker (Planned) |
Erica T. Lilleodden |
Abstract Scope |
The influence of detwinning and twinning on the constitutive mechanical response of Mg was investigated via microcompression tests of single crystalline pillars of nominal [0001] and [10-10] orientations, and bicrystalline pillars containing a single {1 0 -1 2} twin boundary. The [0001] pillars exhibit the highest initial yield strength while the [10-10] and bicrystalline pillars initially yield at a significantly lower stress at which twin nucleation and growth or migration commences. Depending on the extent of straining, the [10-10] and bicrystalline pillars exhibit a secondary yield point associated with the deformation of the newly formed [0001] oriented pillar. The mechanical results point to an anisotropy in the mechanical consequence of twin motion, as characterized through the comparison of the three micropillar orientations; a twin-mediated hardening is indicated by the relative stress-strain behavior. |
Proceedings Inclusion? |
Planned: |