文献类型：期刊文献

英文题名：High Density of Interfaces With Severely Mechanical Difference Controlled High Ductility in Heterogeneous Materials Based on Crystal Plasticity

作者：Zhang, Yong[1];Zhang, Xian-Cheng[1];Jia, Yun-Fei[1];Li, Dong-Feng[2];Yuan, Guang-Jian[1];Chen, Hao[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Meilong Rd 130, Shanghai 200237, Peoples R China;[2]Harbin Inst Technol, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China

年份：2022

卷号：53

期号：11

起止页码：3918

外文期刊名：METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE

收录：;EI(收录号：20223812771527);WOS:【SCI-EXPANDED(收录号:WOS:000854728900001)】；

基金：This work was sponsored by the National Key Research and Development Program of China (2018YFC1902404), the National Natural Science Foundation of China (51725503,51975211), Shanghai Rising-Star Program (20QA1402500) and Foundation Strengthening Plan Technology Field Fund Project (2019-JCJQ-JJ-454). The authors are also grateful to Prof. Esteban Busso for his fruitful discussion and insightful comments.

语种：英文

外文关键词：Crystal microstructure - Deformation - Dislocations (crystals) - Ductility - Grain boundaries - Grain size and shape - Low carbon steel - Mechanisms - Plasticity - Size determination - Size distribution - Strain - Yield stress

摘要：The synthesis of various heterogeneous structures has provided a new design principle for the unprecedented mechanical properties of metallic materials, such as strength-ductility synergy and extraordinary strain hardening. However, the key parameter that controls such properties remains a challenging issue. For solving this, a series of simulations of HSs with precisely controlled microstructure have been done to examine its effect on mechanical properties based on the crystal plasticity model which is modified to take grain boundary hardening, hetero-deformation induced hardening and size-dependent damage variable into account. As for the microstructures with various grain size distributions (100 nm to 100 mu m) for pure nickel and low carbon steels, the numerical results show good agreement with the experimental data in regards to the yield stress, subsequent strain hardening and uniform ductility. Furthermore, by manipulating the spatial distribution of coarse grains, the deformation mechanisms of three typical types of heterogeneous structures with bimodal size distributions were analyzed. In addition, the relationship between the interfaces with severely mechanical difference and strain hardening was quantitatively investigated. Overall, these findings can provide valuable guidance to the optimal design of heterogeneous microstructures with superior properties. (C) The Minerals, Metals & Materials Society and ASM International 2022