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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 2    April 2006

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Superplasticity and superplastic instability of AZ31B magnesium alloy sheet
WANG Ling-yun(汪凌云)1, SONG Mei-juan(宋美娟)1, 2, LIU Rao-chuan(刘饶川)2

1.College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2.Department of Mechanical Engineering,Chongqing University of Science and Technology, Chongqing 400050, China

Abstract: Superplastic deformation mechanism of AZ31B magnesium alloy sheet was investigated. Maximum elongation of 216% and strain rate sensitivity of 0.36 were obtained at 723 K and a strain rate of 1×10−3s−1. It is found that dynamic recrystallization occurs at the early deformation stage, and that grain boundary sliding is the dominant deformation mode of superplastic AZ31B sheet, whose fracture is due to the growth and interlinkage of cavities nucleated at grain boundary. A cavity growth model was established, and damage characteristic parameters as well as the critical value of damage variable were identified so as to provide a theoretical ground on which the plastic forming technology of magnesium alloy sheet can be optimized.

 

Key words: AZ31B magnesium alloy; superplasticity; superplastic instability; strain sensitivity; cavity evolution; damage

ISSN 1672-7029
CN 43-1423/U

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