张丁非,张钧萍,胡红军,王小红

• 1:重庆大学材料科学与工程学院
• 2:国家镁合金材料工程技术研究中心
• 3:重庆理工大学材料科学与工程学院
• 4:西南石油大学材料科学与工程学院

摘要(Abstract)：

研究将普通挤压和等通道角挤压工艺结合而开发出的新型复合挤压工艺。采用有限元技术建立具有不同摩擦系数和不同转角的模型,模拟镁合金复合挤压过程,分析复合挤压力变化特征,以及挤压过程的应变累积情况。结果表明,摩擦系数增大或者通道角减小,复合挤压的挤压力和等效应变增加。摩擦和转角均会引起变形的不均匀性,摩擦因数越大,通道转角越小,其不均匀性越大。在摩擦因数为0.3,通道转角为120°时可以获得较大且均匀的等效应变。

关键词(KeyWords)： 复合挤压;有限元模拟;挤压载荷;等效应变;摩擦

Abstract:

Keywords:

基金项目(Foundation): 国家“973”重大基础研究项目(2007CB613700);; 国家杰出青年科学基金(50725413);; 重庆市科技攻关项目(CSTC2009AB4008);; 重庆市科委资助项目(2010CSTC-HDLS);; 重庆大学研究生科技创新基金个人项目(CDJXS10130009)

作者(Author): 张丁非,张钧萍,胡红军,王小红

DOI: 10.13289/j.issn.1009-6264.2012.09.029

参考文献(References)：

• [1]Li B,Joshi S,Azevedo K,et al.Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP[J].Materials Scienceand Engineering A,2009,517(1-2):24-29.
• [2]Su C W,Lu L,Lai M O.A model for the grain refinement mechanism in equal channel angular pressing of Mg alloy from microstructural studies[J].Materials Science and Engineering A,2006,434(1-2):227–236.
• [3]Wang Q D,Chen Y J,Lin J B,et al.Microstructure and properties of magnesium alloy processed by a new severe plastic deformation method[J].Materials Letters,2007,61(23-24):4599-4602.
• [4]Sekhar Na Ga A V,Tick-Hon Y.Optimal tool angles for equal channel angular extrusion of strain hardening materials by finite element analysis[J].Computational Materials Science,2004,30(3-4):489-495.
• [5]Masoudpanah S M,Mahmudi R.The microstructure,tensile,and shear deformation behavior of an AZ31 magnesium alloy after extrusion and equalchannel angular pressing[J].Materials and Design,2010,31(7):3512-3517.
• [6]Zhang Jing,Zhang Ke-shi,Wu Hwai-Chung,et al.Experimental and numerical investigation on pure aluminum by ECAP[J].Transactions ofNonferrous Metals Society of China,2009,19(5):1303-1311.
• [7]张丁非,张钧萍,胡红军.模具结构对镁合金棒材裂纹形成的有限元和实验研究[J].材料热处理学报,2011,32(2):151-156.ZHANG Ding-fei,ZHANG Jun-ping,HU Hong-jun.Influence of die geometry on crack formation of magnesium alloy rods based on finite elementsimulation and experiment[J].Transactions of Materials and Heat Treatment,2011,32(2):151-156.
• [8]Seung C Y,Min H S,Krishnaiah A,et al.Finite element analysis of rotary-die equal channel angular pressing[J].Materials Science and EngineeringA,2008,490(1-2):289-292.
• [9]Xu Shu-bo,Zhao Guo-qun,Ren Xu-fang,et al.Numerical investigation of aluminum deformation behavior in three-dimensional continuous confinedstrip shearing process[J].Materials Science and Engineering A,2008,476(1-2):281-289.
• [10]Jin Y G,Son I H,Kang S H,et al.Three-dimensional finite element analysis of multi-pass equal-channel angular extrusion of aluminum AA1050 withsplit dies[J].Materials Science and Engineering A,2009,503(1-2):152-155.
• [11]Zenji H,Matsubara K,Makii K,et al.A two-step processing route for achieving a superplastic forming capability in dilute magnesium alloys[J].Scripta Materialia,2002,47(4):255-260.
• [12]Matsubara K,Miyahara Y,Horita Z,et al.Developing superplasticity in a magnesium alloy through a combination of extrusion and ECAP[J].ActaMaterialia,2003,51(11):3073-3084.

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