|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Magnesium Technology 2016
||Non-dislocation Based Room Temperature Plastic Deformation Mechanism in Magnesium
||Bo-Yu Liu, Zhi-Wei Shan, Evan Ma
|On-Site Speaker (Planned)
Dislocation and deformation twinning are traditionally known to be plasticity carriers of crystalline materials at room temperature. By using in-situ TEM mechanical testing technique, here we report that the plasticity of a specially orientated single crystal magnesium can be carried out neither by dislocation nor by twinning, but through a non-dislocation based process, termed as unit-cell-reconstruction. After the reconstruction, a ~7% strain is produced. The newly formed grain and its parent grain are separated by a boundary that mainly consisted of basal-prismatic interfaces. The migration velocity of such boundary is closely related to the external applied stress. Very interestingly, the boundary can migrate back and forth under a cyclic loading and therefore produce a reversible plastic deformation. Moreover, the effects of the precipitates on the migration of such boundary in magnesium alloys is also studied. The reported novel mechanism may have important implications for the alloy design of magnesium.
||Planned: A combination print-CD volume