Shock compression and spallation damage of high-entropy alloy Al_(0.1)CoCrFeNi  

作　　者：N.B.Zhang J.Xu Z.D.Feng Y.F.Sun J.Y.Huang X.J.Zhao X.H.Yao S.Chen L.Lu S.N.Luo 

机构地区：[1]Key Laboratory of Advanced Technologies of Materials,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China [2]The Peac Institute of Multiscale Sciences,Chengdu 610031,China [3]Department of Engineering Mechanics,South China University of Technology,Guangzhou 510641,China

出　　处：《Journal of Materials Science & Technology》2022年第33期1-9,共9页材料科学技术（英文版）

基　　金：financially supported in part by the Sichuan Province Key R&D Program(No.2022YFG0033);the National Natural Science Foundation of China(Nos.11627901 and11902274)。

摘　　要：Shock compression and spallation damage of a face-center cubic phase high-entropy alloy(HEA)Al_(0.1)CoCrFeNi were investigated via plate impact experiments along with free surface velocity measurements.Postmortem samples were characterized with transmission electron microscopy and electron backscatter diffraction.The Hugoniot equation of state and spall strength at different impact strengths were determined.There exists a power-law relation between spall strength and strain rate.The spall strength of Al_(0.1)CoCrFeNi HEA is about 50%higher than those of previously studied HEAs and comparable to those widely applied structural stainless steels at the same shock stress.Dislocation glide and stacking faults are the important deformation mechanisms in the Al_(0.1)CoCrFeNi HEA.Nanotwins are only observed at high shock stress.Damage in the Al_(0.1)CoCrFeNi HEA is ductile in nature.Voids are nucleated preferentially in grain interiors,and the intragranular voids show a strong dependence on grain boundary misorientation and peak stress.

关 键 词：Al_(0.1)CoCrFeNi High-entropy alloy HUGONIOT Spall damage MICROSTRUCTURE 

分 类 号：TG139[一般工业技术—材料科学与工程]