期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138502
关键词
Mg-Zr alloy; Superplasticity; Shear punch test
Addition of 0.7 wt% Zr to pure Mg resulted in a bimodal structure, consisting of both coarse and fine recrystallized grains with a mean grain size of 2.8 mu m, and a large fraction of high angle grain boundaries after extrusion. A maximum strain rate sensitivity index of 0.42, obtained by shear punch test (SPT) at 673 K, together with activation energy of 96 kJ mol(-1) indicated that grain boundary sliding controlled by grain boundary diffusion is the dominant mechanism in superplastic regime.
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