hcp结构TiZrHf中熵合金变形行为的准原位EBSD研究  

Quasi-in-situ EBSD Study on the Deformation Behavior of TiZrHf Medium Entropy Alloys with hcp Structure

作　　者：张玉晴 张东东 易萌 匡杰 刘刚[1,2] 孙军[1,2] Zhang Yuqing;Zhang Dongdong;Yi Meng;Kuang Jie;Liu Gang;Sun Jun(School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China;State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学材料科学与工程学院,陕西西安710049 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《稀有金属材料与工程》2023年第2期719-727,共9页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51801147,51790482)。

摘　　要：通过真空电弧炉熔炼和冷轧退火的方法成功制备了具有均匀等轴晶组织的TiZrHf中熵合金和纯Ti。X射线衍射(XRD)和电子背散射衍射(EBSD)实验证实TiZrHf合金与纯Ti都为单相hcp结构,轴比接近,且二者经冷轧退火后均表现出明显的基面织构。为了对比这2种轴比相似的hcp金属在塑性变形机制上的差异,使用扫描电镜(SEM)和EBSD技术对TiZrHf合金和纯Ti在单向拉伸过程中的微观组织和织构演化进行了准原位表征。滑移迹线分析结果表明,相比于纯Ti,TiZrHf合金中锥面滑移和{10■2}拉伸孪晶的活跃程度显著提高,而{11■2}压缩孪晶的活跃程度则相应降低。TiZrHf medium entropy alloy and pure Ti with uniform equiaxed grains were successfully prepared by vacuum arc furnace melting and annealing after cold rolling. X-ray diffraction(XRD) and electron backscatter diffraction(EBSD) results show that TiZrHf alloy and pure Ti are single-phase hcp structure with the close c/a ratio and basal texture after cold rolling and annealing. In order to compare the differences in plastic deformation mechanism between the two hcp metals, the microstructure and texture evolution during uniaxial tension were characterized by scanning electron microscope(SEM) and electron back scattered diffraction(EBSD). The results of slip trace analysis show that compared with pure Ti, the activities of pyramidal slip and {10■2} tension twins in TiZrHf alloy increase significantly while the activity of {11■2} compression twins decreases.

关 键 词：hcp中熵合金 变形机制 滑移迹线 织构 准原位EBSD 

分 类 号：TB139[理学—物理]