摘要
Superelasticity has been widely used in various fields.High elastic limit simultaneously with large superelasticity is urgent in the critical applications.In this study,we have employed the high entropy alloy(HEA)concept to develop a new TiHfNiFe-Nb eutectic HEA(EHEA)based on the TiNi-Nb eutectic alloy.The results show the directional catkin-like microstructure with the fiber eutectic in the center and the lamella eutectic in the outside form along the directional solidification direction when the growth rate is 60 mm/h.The corresponding specimens display the high strength of 1409 MPa and superelasticity of 3.1%in tension at room temperature,which is attributed to the synergetic effect of high entropy,preferred orientation,ordered body-centered cubic(B2)phase and disordered body-centered cubic phase in the eutectic structure.This work sheds light on designing the high-performance superelastic function materials with EHEAs.
基金
financially supported by the National Natural Science Foundation of China(Grant Nos.52074257 and 51790484)
the Chinese Academy of Sciences(Grant No.ZDBS-LY-JSC023)。
作者简介
Zheng-Wang Zhu,zwzhu@imr.ac.cn。
