(上海交通大学 轻合金精密成型国家工程研究中心，上海 200240)
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， 压缩孪生为主要的孪生类型；在纯室温单向变形过程中， 压缩孪生导致了纯Zn明显的拉压不对称性。另外， 压缩孪生变形在晶间发生传递，利用 因子值可以评价孪生在晶间传递的可能性，取向接近、 值越大的晶粒间越容易发生孪生传递。
关键字: Zn；孪生；拉压不对称；变形协调因子
（National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract: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 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 was discussed to assess the possibility. It indicates that the more similar of grain orientation and the larger of value are, the more likely twin-twin transfer tends to happen.
Key words: zinc; twinning; tension-compression yield asymmetry; deformation compatibility factor
