Microstructure and mechanical properties of a novel refractory AlNbTiZr high-entropy alloy |
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| Authors: | W Chen H Wang Y C Xie X H Yan |
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| Affiliation: | 1. College of Materials Science and Engineering, Fuzhou University, Fuzhou, People’s Republic of China;2. College of Materials Science and Engineering, Fujian University of Technology, Fuzhou, People’s Republic of China;3. Fujian Provincial Key Laboratory of Advanced Materials Processing and Application, Fuzhou, People’s Republic of China |
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| Abstract: | The microstructure and mechanical properties of a novel refractory AlNbTiZr high-entropy alloy (HEA) with a low density of ～5.85?g?cm?3 were investigated after arc melting and homogenisation at 1473?K for 5?h. The as-cast HEA exhibits a single-phase ordered body-centred cubic (B2) structure. A hexagonal Zr5Al3-type second phase is introduced into the HEA through homogenisation treatment, resulting in increase of the yield strength, ultimate compressive strength and fracture strain by 70?MPa, 308?MPa and 9.2%, respectively. These results indicate that the introduction of the hexagonal Zr5Al3-type second phase into the B2 matrix can simultaneously improve the HEA strength and ductility, showing a strength–ductility combination superior to those of most reported refractory HEAs. |
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| Keywords: | Refractory high-entropy alloy B2 structure strengthening toughening |
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