Orientation, temperature and strain rate effects in deformation twinning of magnesium

Conference Dates

October 2 – 7, 2022


Deformation twinning (DT) has a very important role in accommodating plastic deformation in hexagonal close packed (HCP) metals due to their limited number of easy slip systems. Unfortunately, DT is also known to be associated with a lack of ductility and high residual stresses, which can lead to cracking, affecting the industrial applicability of these metals and making them only partially competitive compared to other light metal alloys. Despite decades of research on DT, many questions remains open about their exact nucleation and propagation mechanisms and their associated defects and stresses in the material. Focusing the study on the {1012} twin mode, we performed in situ tensile and compression tests at the micron-scale on suitably oriented single crystal pure magnesium over 7 order of magnitude of strain rate (from 10 -4 to 500 s-1) and at different temperatures (from 293 to 573 K). 3D HR-EBSD is used to characterize the shape of the twins as well as the distribution of the residual stresses and the geometrically necessary dislocation (GND) inside the deformed volume of the material. TEM is used to characterize the activated dislocations and twin plane features for the different deformation conditions.

Please click Download on the upper right corner to see the full abstract.

This document is currently not available here.