一种亚稳型β钛合金在高应变率下的多种变形机制（英文）  

Multiple Deformation Mechanisms of a Metastable β Ti-V Alloy at High Strain Rates

作　　者：王翘楚 惠松骁[1] 叶文君[1] 刘睿[1] 于洋[1] Wang Qiaochu;Hui Songxiao;Ye Wenjun;Liu Rui;Yu Yang(State Key Laboratory for Fabrication & Processing of Nonferrous Metals,General Research Institute for Nonferrous Metals,Beijing 100088,China)

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室

出　　处：《稀有金属材料与工程》2019年第5期1415-1420,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51601016)

摘　　要：以二元Ti-16V合金为研究对象,采用霍普金森压杆装置、光学显微镜、电子背散射衍射技术以及透射电子显微镜,分别测量并分析了高应变率下Ti-16V合金的动态力学性能、微观组织演变以及塑性变形机制。得出如下结论:Ti-16V合金的流变抗力与应变硬化速率对应变率不敏感;Ti-16V合金的临界失稳应变率约为3000 s-1;{332}<113>型孪生与应力诱发ω相变为Ti-16V合金高应变率下的主导塑性变形机制;通过本研究构建的孪生Schmid因子计算模型,定量核算与模拟{332}<113>型孪生的Schmid因子,结合实验结果表明Schmid因子是决定晶粒是否发生孪生的重要参数。Dynamic compressive properties, microstructure evolution and deformation modes of binary Ti-16 V alloys have been investigated. Mechanical tests were performed on the split Hopkinson pressure bar. In addition, optical microscopy, electron backscatter diffraction technique and transmission electron microscopy were applied to observe deformed microstructures. The results show that flow stress and strain hardening rate are both insensitive to loading strain rates. Critical instability strain rate of Ti-16 V alloys is measured to be about 3000 s-1. {332}<113> type mechanical twinning and stress induced ω phase transformation are dominant dynamic deformation modes of Ti-16 V alloys. Schmid factor, calculated by the twinning Schmid factor model, is proved to be a key parameter determining the activation of twinning behavior of Ti-16 V alloys.

关 键 词：亚稳Β钛合金 动态变形 变形机制 孪生 

分 类 号：TG146.23[一般工业技术—材料科学与工程]