Abstract
Transformation-induced plasticity(TRIP)endows material with continuous work hardening ability,which is considered as a powerful weapon to break the strength-ductility tradeoff.However,FCC based alloys with TRIP effect can not get rid of the"soft"feature of the structure entirely,resulting in insufficient yield strength.Here,a CoxCr25(AlFeNi)75-x high-entropy alloy is designed.NiAl phase is used as strength-ening component to improve yield strength,while TRIP effect ensures plasticity.Compared with the pre-vious TRIP high-entropy alloy,its yield strength is nearly doubled,and the uniform elongation is more than 55％at room temperature.Furthermore,the corresponding multiphase microstructure evolution and deformation mechanisms are investigated.Significantly,stacking faults and Σ3 twin boundaries are con-firmed to be the nucleation sites of HCP phase by HAADF-STEM.Ingenious composition design and proper heat treatment process make it a perfect combination of precipitation strengthening and transformation-induced plasticity,and thus guide design in the high-performance alloy.
基金项目
This research was supported by the Fundamental Research Funds for the Central Universities(N2009007)
This research was supported by the Fundamental Research Funds for the Central Universities(N150902001)
Foundation of Liaoning Educational Committee for key laboratory(LZ2015042)
and National Natural Science Foundation of China(21978045)
NETL
NSTL
维普
万方数据