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摘要：
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介绍了一种先进的超塑性反挤压成形新工艺,使用这种工艺将一个工业牌号的变形镁合金AZ31D的圆形坯料成形出一个杯形零件。成形后零件的几何尺寸精度完全满足工程需要无需任何机械加工。这种超塑性成形工艺使这种镁合金材料的微观组织和机械性能得到很大提高。材料的晶粒度由原始坯料的几百微米细化到了5~10微米,材料硬度由原始坯料的43HB提高到了57HB,硬度提高26.7%。文中介绍了试验过程,分析了这种超塑性成形提高材料组织性能的原因。
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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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基金项目：
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国家自然科学基金项目(5027510)
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作者简介：
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参考文献：
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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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