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

摘要:

使用真空电弧炉熔炼出TiZrHf中熵合金和纯Ti,利用冷轧及退火得到再结晶后的等轴晶粒,并采用 X射线衍射方法研究其相组成；使用扫描电镜和EBSD对TiZrHf合金和纯Ti组织进行表征并进行滑移迹线分析。结果表明: TiZrHf合金与纯Ti都为单相HCP结构且轴比接近,经再结晶后织构类型都为基面织构。在室温下沿RD拉伸变形10%时,TiZrHf合金的锥面滑移开动比例为26%,接近纯Ti中锥面滑移晶粒占比的两倍,且生成{10-12}拉伸孪晶的数量明显多于纯Ti。

Abstract:

: TiZrHf medium entropy alloy and pure Ti were prepared in vacuum arc furnace. The equiaxed grains were obtained by cold rolling and annealing, and their phase composition was studied by X-ray diffraction. Scanning electron microscope and Electron back scattered diffraction was performed to study the microstructure and in-grain slip activities of TiZrHf alloy and pure Ti. The results show that both TiZrHf alloy and pure Ti are single-phase HCP structure with approximately the same axial ratio, and their texture are basal texture after recrystallization. The pyramidal slip of TiZrHf alloy occupy a high fraction of～26% at 10% tensile strain along RD, which is twice the proportion of pyramidal slip in pure Ti, and the number of {10-12} tensile twins is significantly more than that of pure Ti.