Remarkably high fracture toughness of HfNbTaTiZr refractory high-entropy alloy  

作　　者：X.J.Fan R.T.Qu Z.F.Zhang 

机构地区：[1]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]Nano Science and Technology Institute,University of Science and Technology of China,Suzhou 215132,China

出　　处：《Journal of Materials Science & Technology》2022年第28期70-77,共8页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51771205);Liao Ning Revitalization Talents Program(No.XLYC1808027)。

摘　　要：High-entropy alloys(HEAs)with face-centered cubic(FCC)phase such as CoCrFeMnNi or CoCrNi generally exhibit ultra-high fracture toughness but relatively low strength.In contrast,body-centered cubic(BCC)HEAs often display higher strengths,but the few reports on fracture toughness measurement demonstrate low toughness values.Here we show that the BCC HfNbTaTiZr refractory HEA,which possesses a combination of high strength,good tensile ductility and excellent high-temperature properties,also exhibits a remarkably high fracture toughness.By using the"single specimen"compliance method for J-integral measurement according to the ASTM E1820–17 standard,its fracture toughness K_(JIC)was experimentally determined to be 210 MPa m^(1/2),which renders this HEA among the toughest metallic materials.The excellent damage tolerance makes the HEA promising for applications as high-temperature structural materials such as in aerospace field.

关 键 词：High-entropy alloys BCC structure Fracture toughness J-INTEGRAL 

分 类 号：TG139[一般工业技术—材料科学与工程]