Novel as-cast AlCrFe2Ni2Ti0.5 high-entropy alloy with excellent mechanical properties  

作　　者：Cheng-bin Wei Xing-hao Du Yi-ping Lu Hui Jiang Ting-ju Li Tong-min Wang 

机构地区：[1]Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China [2]School of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China [3]College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao 266590,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第10期1312-1317,共6页矿物冶金与材料学报（英文版）

基　　金：the National Key Research and Development Program of China(No.2017YFA0403803);the National Natural Science Foundation of China(Nos.51525401,51774065,51601028,and 51690163).

摘　　要：We designed a novel Co-free AlCrFe2Ni2Ti0.5 high-entropy alloy(HEA)that features an excellent combination of strength and ductility in this study.The as-cast AlCrFe2Ni2Ti0.5 alloy showed equiaxed grains undergoing spinodal decomposition,which consisted of ultrafine-grained laminated body-centered cubic(bcc)phases and an ordered body-centered cubic(b2)phase,and some precipitates embedded in the b2 matrix.The bcc and b2 phases also feature a coherent interface.This unique structure impedes mobile dislocations and hinders the formation of cracks,thereby giving the AlCrFe2Ni2Ti0.5 HEA both high strength and plasticity.At room temperature,the as-cast AlCrFe2Ni2Ti0.5 alloy exhibited a compressive yield strength of 1714 MPa,an ultimate strength of 3307 MPa,and an elongation of 43%.These mechanical properties are superior to those of most reported HEAs.

关 键 词：high-entropy alloys mechanical properties coherent interface spinodal structure 

分 类 号：TG139[一般工业技术—材料科学与工程]