Micro-compression of high oxygen doped single-crystal titanium along different orientations-猫眼课题宝

高氧掺杂单晶钛沿不同取向的微压缩

DOI：

10.1016/j.msea.2021.142449

发表时间：

2022-01

期刊：

Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing

影响因子：

6.4

通讯作者：

中科院分区：

材料科学1区

文献类型：

作者：

Wang X.;Lu S.;Chen B.;Junko U.;Shibutani Y.;Kondoh K.;Shen J.

为了探究高氧掺杂α-Ti的变形机理，采用聚焦离子束（FIB）铣削技术，以高氧含量的工业纯Ti （CP-Ti）为原料，制备了取向接近0°、45°和90°倾斜c轴的单晶微柱。微柱在准静态压缩下加载。解剖分析表明，45°取向和90°取向试样只有棱柱滑移被激活，其临界分解剪切应力（CRSS）值分别为457 MPa和596 MPa； 0°取向试样只有{10-11}<c+a>的一阶锥体滑移被激活，CRSS约为1019 MPa。结果表明，氧的加入显著降低了α-Ti的非棱柱滑移和棱柱滑移之间的CRSS比。此外，研究结果还表明，α-Ti单晶在微观尺度上可能不适用Schmid定律。

To explore the deformation mechanism of α-Ti with high oxygen doping, micro-pillars of single crystal with orientations of near 0°, 45°, and 90° inclined toc-axis were fabricated via focused ion beam (FIB) milling from a high oxygen content commercial purity Ti (CP–Ti). The micro-pillars were loaded under quasi-static compression. Post-mortem analysis reveals that only prismatic slip activated for 45° and 90° oriented samples with their critical resolved shear stress (CRSS) values of about 457 MPa and 596 MPa, and only {10–11}<c+a> the first-order pyramidal slip activated on the 0° sample with a CRSS of around 1019 MPa. The results suggest that the oxygen addition remarkably reduces the CRSS ratio between non-prismatic and prismatic slips of α-Ti. In addition, the results indicate that the Schmid law may not be applicable for α-Ti single crystal at micro-size level.