Synthesis of ultrafine dual-phase structure in CrFeCoNiAl_(0.6)high entropy alloy via solid-state phase transformation during sub-rapid solidification  

作　　者：Chen Chen Yanzhou Fan Wei Wang Hang Zhang Jialiang Hou Ran Wei Tao Zhang Tan Wang Mo Li Shaokang Guan Fushan Li 

机构地区：[1]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [2]School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China [3]Key Laboratory of Aerospace Materials and Performance(Ministry of Education),School of Materials Science and Engineering,Beihang University,Beijing 100191,China [4]School of Materials Science and Engineering,Georgia Institute of Technology,Atlanta,GA 30332,USA

出　　处：《Journal of Materials Science & Technology》2022年第18期253-260,共8页材料科学技术（英文版）

基　　金：supported by National Natural Science Foundation of China [grant nos. 51701183, U1704159];China Postdoctoral Science Foundation funded project [grant no. 2017M622368,2018M630834]

摘　　要：High entropy alloys(HEAs)with superb mechanical properties have been traditionally produced by solid-ification and subsequent heat treatment,In this paper,we demonstrate a new route via one-step process using sub-rapid cooling.Under proper cooling rates,the CrFeCoNiAl^(0.6) HEA could form ultrafineFCC+BCC dual-phase structure.By varying cooling rate,we can control the fraction of the BCC phaseand refinement of FCC microstructures that have tunable mechanical properties in yield strength and hardness ranging from~580 to~1460 MPa and~260 to~550 Hv.We show that the structure-property-processing relation originates from the sideplate microstructures formed during fast cooling that havespecific crystallographic orientation relationship between the FCC and BCC phases and chemical segrega tion.This work provides a new setting for better understanding of the solid-state phase transformation in HEAs under sub-rapid solidification conditions as well as a novel method for development of high-performance HEAs.

关 键 词：High entropy allay Cooling rate Orientation Mechanical properties Phase transition 

分 类 号：TG139[一般工业技术—材料科学与工程]