The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China; Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials, and Biomedical Engineering, University of Texas at El Paso, El Paso, TX, 79968, USA.
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China.
J Mech Behav Biomed Mater. 2021 Jun;118:104473. doi: 10.1016/j.jmbbm.2021.104473. Epub 2021 Mar 19.
Micro/nano-scale deformation behavior including hardness, elastic modulus, and pop-ins, was studied in a medical austenitic stainless steel followed by post-mortem EBSD characterization. Relatively higher hardness and modulus was observed near {101} and more pop-ins occurred in this orientation at high loading rate. The activation volume (v) obtained from nanoindentation had weak dependence on grain orientation and was ~10-20 b, indicating that neither diffusional creep processes nor conventional dislocation segments passing through dislocation forests controls plastic deformation in our study. The plastic zone radius (c) and the distance of the indent from the grain boundary (d) were used to describe the effect of grain boundary on the pop-in effect. The ratio of c/d meets amplitude version of Gaussian peak function distribution for a given orientation, whose peak value remains nearly constant for all the orientations.
研究了医用奥氏体不锈钢的微/纳米尺度变形行为，包括硬度、弹性模量和压入突跳，并进行了事后 EBSD 特征描述。在高加载速率下，靠近{101}的硬度和模量较高，并且在该方向上发生了更多的压入突跳。从纳米压痕获得的激活体积（v）对晶粒取向的依赖性较弱，约为 10-20 b，表明在我们的研究中，既不是扩散蠕变过程，也不是传统的位错段穿过位错林控制塑性变形。塑性区半径（c）和压痕距晶界的距离（d）用于描述晶界对压入突跳效应的影响。对于给定的取向，c/d 的比值满足高斯峰函数分布的幅度版本，其峰值对于所有取向几乎保持不变。
