期刊
ACTA MATERIALIA
卷 89, 期 -, 页码 408-422出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.12.006
关键词
Texture; Twinning; Low-temperature formability; Magnesium; Equal channel angular processing
资金
- NPRP grant from Qatar National Research Fund (a member of Qatar Foundation) [4-1411-2-555]
Low-temperature shear formability of Mg-3Al-1Zn (AZ31) alloy samples with two different starting textures was investigated via the equal-channel angular processing (ECAP) technique. Under careful texture modifications, the low temperature limit for the ECAP of AZ31 was reduced from the typical processing temperature of 200 degrees C down to 150 degrees C by suppressing the compression twinning activity and, instead, promoting prismatic slip. At 150 degrees C, with the basal poles initially parallel to the extrusion direction (ED), the sample failed during ECAP; however, it was successfully processed at the same temperature when the basal poles were perpendicular to the ED. A crystal plasticity model was used to gain a deeper understanding of operating deformation modes and dynamic recrystallization during the ECAP of different starting textures at 150 degrees C, the latter of which was found to play a significant role in shear localization during ECAP. Detailed electron backscatter diffraction analyses and the simulation results clearly indicate that the formation of compression twins causes deformation localization, followed by dynamic recrystallization within the compression twins at 150 degrees C. This non-uniform dynamic recrystallization causes local softening and large shear bands, and eventual failure during ECAP. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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