胡红军,张丁非,杨明波

• 1:重庆理工大学材料与科学工程学院
• 2:重庆大学国家镁合金材料工程技术研究中心

摘要(Abstract)：

针对镁合金的棒材的工业化制备和加工,提出了一种新型的镁合金复合挤压方法,将正挤压(Extrusion)和剪切(Shear)结合(简称ES),建立了ES挤压的三维有限元热力耦合模型及条件,模拟了ES挤压的流动网格、累积应变演化,设计并制造了适合于卧式挤压机上的ES挤压模具,进行了ES工艺实验。数值模拟结果表明,ES挤压可以显著提高镁合金变形过程的累积应变;试验结果表明,ES挤压可以得到尺寸很小的动态再结晶晶粒,并改善了组织均匀性;理论分析表明,ES挤压过程镁合金具有多级动态再结晶的特性,可以逐步有效的细化微观组织。ES挤压在模具结构、工艺参数合理的条件下可以大大细化镁合金微观组织,并具有工业生产的实用性。

关键词(KeyWords)： 变形镁合金;ES变形;晶粒细化;微观组织

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51101176);; 国家“973”重大基础研究项目(2007CB613700);; 国家“十二五”科技支撑计划项目(2011BAE22B03-3);; 重庆市科委自然科学基金(CQ CSTC.2010BB4301)

作者(Author): 胡红军,张丁非,杨明波

DOI: 10.13289/j.issn.1009-6264.2012.10.028

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