文献类型：期刊文献

英文题名：Strain-Rate and Size Dependence of Gradient Lamellar Nickel Investigated by In-Situ Micropillar Compression

作者：Wang, Zi-Meng[1]; Jia, Yun-Fei[1]; Cai, Jia-Dong[1]; Cui, Yuan-Yuan[2]; Li, Xiao[3]; Zhang, Xian-Cheng[1]; Tu, Shan-Tung[1]

机构：[1] Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China; [3] School of Engineering, Huzhou University, Zhejiang, 313000, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230371072)

语种：英文

外文关键词：Compression testing - Grain boundaries - Nickel - Plastic deformation

摘要：Strain rate plays a nonnegligible role in the plastic deformation behavior of metallic materials with heterogeneous nanostructure, while little research focuses on the topic. In-situ compression tests at various strain rates were conducted on the micropillars located at different depths from the gradient lamellar Ni. These tests intended to reveal the strain-rate dependence of micropillars with different lamellar thicknesses and illustrated the competitive relationship between strain rate and intrinsic grain size on the plastic deformation behavior of metallic materials. In addition, due to the strain rate sensitivity being related to not only intrinsic size but also external size, single Ni micropillars with different diameters were also compressed at various strain rates in order to clarify the competitive relationship between intrinsic size and external size on the strain rate sensitivity. It is found that lamellar thickness rather than strain rate has more effect on plastic deformation, and the external size exhibits a more obvious impact on the strain rate sensitivity. The plastic deformation behaviors of different micropillars are mainly explained by the transitions in the effect of lamellar grain boundaries on the dislocation motion at various strain rates and over different lamellar thicknesses, resulting in the change of dislocation multiplication and annihilation rate. ? 2023, The Authors. All rights reserved.