Dynamic mechanical properties,deformation and damage mechanisms of eutectic high-entropy alloy AlCoCrFeNi_(2.1)under plate impact  

作　　者：S.P.Zhao Z.D.Feng L.X.Li X.J.Zhao L.Lu S.Chen N.B.Zhang Y.Cai S.N.Luo 

机构地区：[1]The Peac Institute of Multiscale Sciences,Chengdu,China [2]Key Laboratory of Advanced Technologies of Materials,Ministry of Education,Southwest Jiaotong University,Chengdu,China

出　　处：《Journal of Materials Science & Technology》2023年第3期178-188,共11页材料科学技术（英文版）

基　　金：sponsored in part by Sichuan Province Key R&D Program(No.2022YFG0033);the National Natural Science Foundation of China(Nos.12102491,52101150,11902274,11627901).

摘　　要：Shock compression and spallation of a eutectic high-entropy alloy(HEA)AlCoCrFeNi_(2.1)with lamellar structure are investigated via plate impact loading with free-surface velocity measurements.The as-cast and postmortem samples are characterized with transmission electron microscopy,electron back-scatter diffraction and scanning electron microscopy.An accurate Hugoniot equation of state is determined.Af-ter shock compression to∼12 GPa,both the L1_(2)and B_(2)phases retain their ordered structures.Dense dislocations in the{111}slip planes,stacking faults and deformation twins are found in the L1_(2)phase,along with fewer dislocations in the{110}slip bands in the B(2)phase.Shock-induced deformation twin-ning within the L1_(2)phase of this HEA is observed as a new deformation mechanism under various load-ing conditions.For spallation,both ductile and brittle damage modes are observed.The micro voids and cracks prefer to nucleate at the phase boundaries chiefly,then in the B(2)phase.Under similar shock stress,the spall strength of AlCoCrFeNi_(2.1)HEA is about 40%higher than those of other reported dual-phase HEAs due to the high stability of its semi-coherent phase boundaries.

关 键 词：High-entropy alloy Hugoniot Spall damage MICROSTRUCTURE 

分 类 号：TG146.21[一般工业技术—材料科学与工程]