High impact toughness of CT20 alloy induced by multi-factor coupling  

作　　者：Runqi Zhang Qinyang Zhao Dizi Guo Yang Ying Huan Wang Zhongli Qiao Yunbo Zhang Lin Wang Yongqing Zhao 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]School of Material Science and Engineering,Chang’an University,Xi’an 710064,China [3]Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China [4]National Key Laboratory of Science and Technology on Materials Under Shock and Impact,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Journal of Materials Science & Technology》2024年第25期65-81,共17页材料科学技术(英文版)

基　　金：financially supported by the National Key Re-search and Development Program of China(No.2022YFB3705605);the Science and Technology Major Project of Shaanxi Province of China(No.2020zdzx04-01-02);the National Natural Science Foun-dation of China(No.52101122);the National Key Laboratory Foundation of Science and Technology on Materials under Shock and Impact(No.6142902220202).

摘　　要：Impact deformation behaviors of CT20 alloy with lamellar microstructure(LM),equiaxed microstructure(EM)and bimodal microstructure(BM)at room temperature were systematically investigated in this study.The experimental results indicated the excellent mechanical properties of CT20 alloy with BM un-der dynamic load.The impact toughness of BM specimen(∼118 J/cm^(2))is∼17.5%higher than that of LM specimen and∼33.8%higher than that of EM specimen.The impact energy of EM specimen is the lowest due to the relatively simple equiaxed microstructure.LM specimen can absorb the highest crack initia-tion energy due to the best twinning ability.The highest impact toughness of BM specimen is induced by multi-factor coupling during impact deformation.Finer initial equivalent grain size,smaller lamellar thickness,lamellar induces twinning,finer twins,crack propagation path,and interaction between twins andβlamellar are all factors affecting impact toughness.

关 键 词：CT20 alloy Impact toughness Deformation twinning Dislocation mobility Crack propagation 

分 类 号：TG1[金属学及工艺—金属学]