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.
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).
