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Abstract：
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An advanced superplastic backward extrusion forming new technology is presented in this paper.By using the technology a cupulate part is formed by the commercial wrought magnesium alloys AZ31D.This is an exciting forming test.Firstly,the formed part can meet the engineering requirement in geometric tolerance without any further machining.Secondly the superplastic forming technology has greatly improved both microstructure and mechanical property of the magnesium alloy.For example,the grain size is refined from several hundred μm of the billet to 5~10 μm of the formed part. The hardness is increased from 43HB of the original billet to 57HB of formed part.The hardness increment is 26.7%.In this paper the details of the experiment process are given,and the experiment results are analyzed.Finally the essence of this kind of special superplastic forming is also discussed.
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Funds：
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国家自然科学基金项目(5027510)
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AuthorIntro：
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Reference：
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[1]Watanabe H,Mukai T,Higashi K.Low temperature super-plastic behavior in ZK60 magnesium alloy[J].Materials Sci-ence Forum,1999(304 306):303 308.
[2]Mukai T,Watanabe H,Higashi K.Application of superplas-ticity in commercial magnesium alloy for fabrication of structur-al components[J].Materials Science and Ttechnology,2000(16):1314 1319.
[3]Langdon T G.An examination of flow processes in high strainrate superplasticity[J].Materials Science Forum,1999(304306):13 20.
[4]张艳姝.镁合金热变形性能试验研究及本构参数识别[D].北京:中国机械科学研究院,2005.
[5]Zhang Yan-shu,Zeng Zhi-peng,Jin Quan-lin.Microstructureproperties study of commercial magnesium alloy AZ31D[J].Materials Science Forum,2004(488 489):641 644.
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