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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Deformation and Transitions at Interfaces
Presentation Title In-situ Probe of Twinning Dynamics at a Tensile Twin Tip in Mg
Author(s) Lin Jiang, M. Arul Kumar, Irene J. Beyerlein, Dalong Zhang, Xin Wang, Subhash Mahajan, Enrique J. Lavernia, Julie M. Schoenung
On-Site Speaker (Planned) Lin Jiang
Abstract Scope Twinning dynamics in metals, such as twin nucleation and propagation is of great interest. In the present study, we developed an in-situ STEM technique for introducing local deformation around a tensile twin (TTW) tip, and thus capturing the twinning dynamics around the TTW tip in Mg. We also utilized full field Fast Fourier Transform model to simulate the local stress variations introduced by the TTW. For the first time, we directly captured the nucleation of a (0-111) compression twin (CTW) around a propagating (0-112) TTW tip during the stressing. Also, we have directly observed the dissociation of this CTW (about 100 nm) into a twin nucleus with only 16-20 atom layers during the unloading. Numerical simulation revealed that the local stress induced by the TTW led to the nucleation and detwinning of the CTW and the (0-111) [01-1-2] CTW was a preferred twin variant to nucleate around the TTW tip.
Proceedings Inclusion? Undecided

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