STUDY OF TWIN BEHAVIOR DURING UNIAXIAL COMPRESSION OF AZ31 MAGNESIUM ALLOY
HUANG Hongtao1), LIU Wei1), A. Godfrey1), TANG Ruihe1), LIU Qing2)
1) Department of Materials Science and Engineering, Tsinghua University, Beijing 100084
2) School of Materials Science and Engineering, Chongqing University, Chongqing 400044
Cite this article:
HUANG Hongtao LIU Wei A. Godfrey TANG Ruihe LIU Qing. STUDY OF TWIN BEHAVIOR DURING UNIAXIAL COMPRESSION OF AZ31 MAGNESIUM ALLOY. Acta Metall Sin, 2012, 48(3): 357-362.
Abstract The effect of inhomogeneous deformation on twinning behavior during uniaxial compression of AZ31 magnesium alloy at room temperature was investigated with electron backscattered diffraction (EBSD technique. The evolution of twin area fraction in three locations, typical of a dead zone, an easy zone and a free zone with strain was analyzed. The results show that the twin area fractions at the locations in dead zone, easy zone and free zone are different at compression strains less than 8\%. As compression strain reaches 8%, the area fraction of extension twins at these three locations is almost the same, and is about 90\%. Inhomogeneous deformation exerts much effect on the twin area fraction at the locations in the three zones at low strains while exerts little effect at high strains. Twin variant selection in the three zones at 2% strain was also analyzed. The results show that the twin variant activation is governed by the Schmid factor criterion in all the three zones. However, the percentage of grains with two twin variant types in free zone is higher than that in dead zone and easy zone, due to the different stress states in this location.
