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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:

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F-36: Analysis of Deposition Path of Solid State Additive Manufacturing of AZ31 Mg Alloy
F-39: Effect of Annealing on Microstructure and Mechanical Properties of Mg-6Al Alloy Plates Processed by Differential Speed Rolling
F-40: Effect of Gradient Nanostructure on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy under High Strain Fate
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F-56: Quantifying Dislocation Behavior in Mg Using a Phase Field Dislocation Dynamics Model Multiple Active Slip Planes
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