Journal
SCIENCE CHINA-MATERIALS
Volume 64, Issue 1, Pages 223-231Publisher
SCIENCE PRESS
DOI: 10.1007/s40843-020-1332-2
Keywords
high-entropy alloy; oxidation resistance; MoTaTiCr; high-temperature application
Categories
Funding
- National Key Research and Development Program of China [2018YFA0703600]
- National Science Fund for Distinguished Young Scholars [51825104]
- Key Research Program of Frontier Sciences of Chinese Academy of Sciences [QYZDY-SSW-JSC017]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB30000000]
- Key Basic and Applied Research Program of Guangdong Province, China [2019B030302010]
- National Natural Science Foundation of China [11790291, 61888102]
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Recent research shows that the excellent oxidation resistance of MoTaTiCr alloy is mainly associated with the formation of a continuous CrTaO(4) oxide layer, suggesting that complex oxides can be effective candidates for enhancing the oxidation resistance of high-entropy alloys.
Refractory high-entropy alloys (HEAs) exhibit remarkable mechanical properties desired for high-temperature applications. However, their oxidation resistance at high temperatures received less attention. Recent work indicates that MoTaTiCrAl alloy exhibits excellent oxidation resistance, but the effects of Al and Cr remain unclear. In this work, we demonstrate that the addition of Al is unnecessary for preventing oxidation of the MoTaTiCrAl alloy and the removal of Al leads to a more oxidation resistant MoTaTiCr medium entropy alloy. Structural and chemical analyses indicate that the excellent oxidation resistance of MoTaTiCr is mainly associated with the formation of continuous CrTaO(4)oxide layer. The results indicate that complex oxides can be adopted as effective candidates for enhancement of oxidation resistance, in addition to typical strategy of forming Al2O3, Cr(2)O(3)or SiO(2)barrier layer.
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