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摘要：
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等径角挤压是获得块体超细晶材料的一种重要方法。针对纯铝粉末多孔材料,采用可压缩刚塑性有限元法对其等径角挤压过程进行数值模拟,并着重分析了静水压力对挤压效果的影响。研究结果表明,等径角挤压具有强烈的致密效果,增加变形体内部的静水压力不仅可以增加试件的变形能力,而且利于提高变形过程中材料的致密速度和获得高致密度的试件。
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The purpose of equal channel angular pressing(ECAP) is to obtain the ultra-fine grained(UFG) materials.The densification and deformation behavior of pure aluminum by powder metallurgy during the ECAP process was studied by compressible rigid plastic FEM.Results show that ECAP process is a useful tool for eliminating the porosities in specimen.Analysis shows that hydrostatic stress state has an important effect on the results of product.High hydrostatic stress state is beneficial to improve the ductility and density of porous metal during the ECAP process.
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基金项目：
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教育部博士学科点专项基金资助项目(040310B2);;
安徽省高校青年教师科研资助项目(2006jq1016)
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作者简介：
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参考文献：
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[1]Chang S Y,Lee K S,Choi S H,et al.Effect of ECAP on mi-crostructure and mechanical properties of a commercial6061Al alloy produced by powder metallurgy[J].Journal ofAlloys and Compounds,2003,354:216-220.
[2]Xia K,Wu X.Back pressure equal channel angular consolida-tion of pure Al particles[J].Scripta Materialia,2005,53:1225-1229.
[3]Doraivelu S M,Gegel H L,Gunasekera J S,et al.A newyield function for compressible P/M material[J].Interna-tional Journal of Mechanical Science,1984,26(9/10):527-535.
[4]Iwahashi Y,Wang J,Hortia Z,et al.Principle of equalchannel angular pressing for the processing of ultra finegrained materials[J].Scripta Materialia,1996,35(2):143-146.
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