期刊
METALS AND MATERIALS INTERNATIONAL
卷 27, 期 10, 页码 4195-4203出版社
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-020-00857-9
关键词
Bimodal phenomenon; Mg-Li alloy; Hot deformation; Twinning; Dynamic recrystallization
资金
- National Natural Science Foundation of China [51675307, 51975329]
- Key Research and Development Program of Shandong Province [2019GGX104067]
During hot compression, the samples of LA43M Mg-Li alloy undergo twinning and dynamic recrystallization processes, where twinning influences the occurrence of dynamic recrystallization and plays a crucial role in microstructure development.
In this study, the samples of LA43M Mg-Li alloy were compressed to the true strains of 0.12, 0.16, 0.36 and 0.60 under 300 degrees C and the strain rate of 0.1 s(-1). Under this condition, the stress-strain curves present a special bimodal phenomenon at the early deformation stage, which is caused by twinning and dynamic recrystallization. In the process of hot compression, extension twins generated first. Twinning accommodated strain and the glide of twinning dislocations dissipated local strain energy, resulting in the first local stress drop. Then extension twins coarsened and devoured all the matrix, leading to the change of grain orientation. Subsequently, dislocations accumulated at the grain boundaries and resulted in the increase in stress. With further strain, dynamic recrystallization occurred, discontinuous dynamic recrystallization is the main dynamic recrystallization mechanism. The generation of dynamic recrystallization resulted in the strain softening and leaded to the second local stress drop. Twinning retards the occurrence dynamic recrystallization and has a crucial influence on the microstructure development during the hot compression of LA43M.
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