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铜双晶水平与垂直晶界压缩形貌观察与分析
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    M orphologic Observation and Analysis of CompressedCopper Bicrystals with Horizontal and Vertical Grain BoundariesDUAN Xian-yun .RUAN Feng.ZHANG Sai-j unSchool of Mechanical and Automotive Engineering.South China University of Technology.Guangzhou。Guangdong 510640,China)Abstract:The microscopic morphologies of uniaxially compressed copper bicrystals(CB)with horizon-tal and vertical grain boundaries(GB)were observed.Experiment results have shown that,under thesame comppressive loading condition and comparing the case of CB sample with horizontal GB,a higherstress exists beside the GB for the CB sample with vertical GB,for which there are much more micro-voidsand cracks,whose locations are much concentrated to or beside the slip lines。

    Key words:grain boundary;crystal plasticity;copper bicrystal;hole;crack在微形冲压中,由于金属晶粒取向不同以及晶界相对加载轴方向的位向不同,单向的外加载荷会转变为复杂的力平衡系统[1 ],晶界在抵抗材料变形与破坏中起到了关键作用 ].因此,研究晶界方向对塑性变形 中孔洞和裂纹的影响有重要的意义。

    目前国内外相关的研究主要集中在循环应力下,不同的晶界方向对铜晶体疲劳失效的影响[4川],并对疲劳裂纹的产生和扩展做出相应的解释9-15].而在微型冲压中,材料的关键变形区和破坏区受力并不是循环应力的交变载荷,大部分是单纯的拉伸力和压缩力,因此有必要研究该受力条件下晶界方向对塑性变形的影响.本文基于以上目的,在铜双晶体的晶界分别处于水平晶界(晶界面为水平面)和垂直晶界(晶界面为垂直面)两种情况下,对受到压缩变形后晶界附近的形貌进行了试验观察分析。

    1 试验材料本实验的铜基材采用台湾 NeoTech公司的纯度为 99.995%,外径为 2.5 mm 的连铸单晶铜线。

    收稿日期:2012-12-21基金项目:国家自然科学基金青年基金项目(50905062)l2012年广东诗密装备与制造技术重点实验室开放课题(PEMT1202)作者简介:段先云(1977-),男,广东广州人,华南理工大学讲师,博士研究生十通讯联系人,E-mail:iensen-dxy###yahoo.corn.cn第 7期 段先云等:铜双晶水平与垂直晶界压缩形貌观察与分析 63formation[J].Scripta Materialia,2003,48(8):1117-1122。

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