室温变形过程中纯Zn的孪生行为对力学性能的影响  

Influence of twinning behavior on mechanical property of pure zinc deformed at room temperature

作　　者：赵梦杰 靳丽[1] 董杰[1] 王锋华 董帅 ZHAO Meng-jie;JIN Li;DONG Jie;WANG Feng-hua;DONG Shuai(National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学轻合金精密成型国家工程研究中心,上海200240

出　　处：《中国有色金属学报》2018年第9期1808-1815,共8页The Chinese Journal of Nonferrous Metals

摘　　要：利用光学金相显微镜(OM)、电子背散射衍射(EBSD)技术,并结合室温力学行为测试,研究挤压、退火及室温拉伸过程中纯Zn的显微组织,讨论孪生行为对纯Zn室温拉伸性能的影响。结果表明:在纯Zn挤压及室温拉伸、压缩过程中,{1012}压缩孪生为主要的孪生类型;在纯室温单向变形过程中,{1012}压缩孪生导致了纯Zn明显的拉压不对称性。另外,{1012}压缩孪生变形在晶间发生传递,利用m￠因子值可以评价孪生在晶间传递的可能性,取向接近、 m'值越大的晶粒间越容易发生孪生传递。The microstructure evolution and mechanical properties were investigated by combined optical microscopy(OM),electron backscattered diffractometry(EBSD)and mechanical property testing at room temperature.The results suggest that{2 1 10}twinning activates in most samples during deformation in Zn and causes tension-compression yield asymmetry during uniaxial loading at room temperature.And the paired twins are observed,where twins can propagate throughout the grains and consequently transfer strain to neighboring grains(termed as twin-twin transfer behavior).A geometric compatibility factor m'was discussed to assess the possibility.It indicates that the more similar of grain orientation and the larger of m'value are,the more likely twin-twin transfer tends to happen.

关 键 词：ZN 孪生 拉压不对称 变形协调因子 

分 类 号：TG146.3[一般工业技术—材料科学与工程]