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标题：Superplastic characteristics and forming of LZ91 Mg-Li alloy sheet
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作者：Shi-jun Shen ; Shao-song Jiang ; Mei Zhan 等
期刊名称：Advances in Mechanical Engineering
印刷版ISSN：1687-8140
电子版ISSN：1687-8140
出版年度：2022
卷号：14
期号：5
页码：1-9
DOI：10.1177/16878132221100644
语种：English
出版社：Sage Publications Ltd.
摘要：Magnesium-lithium (Mg-Li) alloys, due to their high specific strength, have great potential in the modern aviation industry. The superplastic characteristics, microstructure evolution, mechanical properties, and forming process of LZ91 Mg-Li alloys at 200°C–300°C were studied in this paper. Tensile tests show that the optimal elongation of tensile specimens is 812.6% at 300°C under a strain rate of 5 × 10−4 s−1. The flow stress of the material increases with strain during the high-temperature tensile testing due to the grain coarsening . Meanwhile, low dislocation densities were observed during tension, which is not sufficient for dynamic recrystallisation to occur. The finite element method is used to investigate the forming schemes of a narrow-mouth box component. Finally, this component was manufactured by the powder pressure bulging process at 300°C experimentally.
关键词：Mg-Li alloy;superplastic forming;grain growth;finite element analysis;grain boundary sliding