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材料工程  2013 

AZ31镁合金等通道转角挤压应变累积均匀性分析及组织性能研究

DOI: 10.3969/j.issn.1001-4381.2013.10.002, PP. 13-19

Keywords: 等通道转角挤压,有限元模拟,变形均匀性分析,AZ31镁合金

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Abstract:

等通道转角挤压工艺(EqualChannelAngularPressing,ECAP)是通过剧烈塑性变形改变微观组织结构生产超细晶粒材料的材料加工方法,工件变形的均匀性一直是ECAP工艺过程中影响材料性能的主要原因之一。采用空间转换法实现了AZ31镁合金多道次ECAP挤压过程中有限元分析相关场量的准确传递,完成了四种不同挤压路径ECAP多道次挤压工艺的有限元模拟,获得了相应挤压件累积等效应变的分布规律。研究确定了经过四道次ECAP挤压以后等效应变累积最为均匀的挤压路径。通过微观组织观察和室温拉伸力学性能实验探讨了不同路径多道次ECAP挤压AZ31镁合金的组织性能变化规律。分析结果表明通过合适的变形路径可以获得细小而均匀的微观组织,当材料的应变累积均匀时,其力学性能也较好。

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