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 demon-strate 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 KJIc was experi-mentally determined to be 210 MPa m1/2,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.

X.J.Fan;R.T.Qu;Z.F.Zhang

Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Nano Science and Technology Institute,University of Science and Technology of China,Suzhou 215132,China

材料科学技术（英文版）

[1]X.J.Fan;R.T.Qu;Z.F.Zhang-.Remarkably high fracture toughness of HfNbTaTiZr refractory high-entropy alloy)[J].材料科学技术（英文版）,2022(28):70-77

HfNbTaTiZr,E1820,KJIc,toughest

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