Tailoring microstructures of CoCrFeNiNb_(0.25)hypoeutectic high-entropy alloy by hot deformation  

作　　者：Xiao-Rong Liu Feng He Jun-Jie Li Ying-Ying Dang Zhi-Jun Wang Jin-Cheng Wang 

机构地区：[1]School of Materials Scienceand Engineering,Northwestern Polytechnical University,Xi'an710072,China [2]Thermal Power Research Institute,Xi'an710054,China

出　　处：《Rare Metals》2022年第6期2028-2037,共10页稀有金属（英文版）

基　　金：financially supported by the National Key R&D Program of China (No.2018YFC0310400);the Research Fund of the State Key Laboratory of Solidification Processing,China (Nos.2020-TS-06 and 2021-TS-02)

摘　　要：CoCrFeNiNb_(0.25)hypoeutectic high-entropy alloy(HEA)has shown good mechanical properties.However,due to interdendritic eutectics,it is challenging to further optimize the microstructure through cold rolling and annealing.The current study showed that hot defor-mation effectively tailored the hypoeutectic microstructure.We investigated the hot deformation behavior and microstructure evolution of the dual-phase CoCrFe-NiNb_(0.25) HEA at different temperatures from 800 to 1000℃and different strain rates from 0.01 to 10.00 s^(-1).The systematic investigation showed the deformation activation energy around 500 kJ·mol^(-1).Microstructure with refined grains and uniformly distributed Laves phases can be obtained after 70%compression at 900℃with a strain rate of 0.01 s^(-1).

关 键 词：Hot deformation High-entropy alloy Microstructure evolution 

分 类 号：TG139[一般工业技术—材料科学与工程]