Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 123, Issue -, Pages 70-77Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2022.01.017
Keywords
High-entropy alloys; BCC structure; Fracture toughness; J-integral
Funding
- National Natural Science Foundation of China [51771205]
- LiaoNing Revitalization Talents Program [XLYC1808027]
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The BCC HfNbTaTiZr refractory HEA exhibits remarkable fracture toughness in addition to its high strength, good tensile ductility, and excellent high-temperature properties. This material shows promise for applications in high-temperature structural materials such as in the aerospace field.
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. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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