High strain rate superplasticity of rolled AZ91 magnesium alloy |
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| Authors: | WANG Qudong WEI Yinhong Y.Chino M.Mabuchi |
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| Affiliation: | 1. State Key Laboratory for Metal Matrix Composites,College of Materiasl Science and Engineering,Shanghai Jiaotong University,Shanghai 200030,China
2. Institute for Structural and Engineering Materials,Nagoya 462-8510,Japan |
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| Abstract: | The high strain rate superplastic deformation properties and characteristics of a rolled AZ91 magnesium alloy at temperatures ranging from 623 to 698 K (0.67Tm-0.76Tm) and high strain rates ranging from 10-3 to 1 s-1 were investigated.The rolled AZ91 magnesium alloy possesses excellent superplasticity with the maximum elongation of 455% at 623 K and a strain rate of 10-3 s-1,and its strain rate sensitivity m is high up to 0.64.The dominant deformation mechanism responsible for the high strain rate superplasticity is still grain boundary sliding (GBS),and the dislocation creep mechanism is considered as the main accommodation mechanism. |
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| Keywords: | AZ91 magnesium alloy high strain rote superplasticity rolling grain boundary sliding |
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