期刊
METALS
卷 12, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/met12010041
关键词
metals and alloys; oxidation; corrosion; surfaces
资金
- National Natural Science Foundation of China [51931005, 52071251]
- Shaanxi Outstanding Youth Fund [2020JC-49]
- Youth Innovation Team of University in Shaanxi Province
- Natural Science Basic Research Program of Shaanxi [2021JQ-645]
- Shaanxi Provincial Education Department [20JK0684]
Alloying with V and Ti elements affects the oxidation behavior of WMoTaNb RHEAs. The addition of V aggravates the volatility of oxides and leads to disastrous internal oxidation. The addition of Ti reduces the mass gain in forming the oxide scale and prolongs the passivation duration.
Alloying with V and Ti elements effectively improves the strength of WMoTaNb refractory high entropy alloys (RHEAs) at elevated temperatures. However, their effects on the oxidation resistance of WMoTaNb RHEAs are unknown, which is vitally important to their application at high temperatures. In this work, the effect of V and Ti on the oxidation behavior of WMoTaNb RHEA at 1000 degrees C was investigated using a thermogravimetric system, X-ray diffraction and scanning electron microscopy. The oxidation of all alloys was found to obey a power law passivating oxidation at the early stage. The addition of V aggravates the volatility of V2O5, MoO3 and WO3, and leads to disastrous internal oxidation. The addition of Ti reduces the mass gain in forming the full coverage of passivating scale and prolongs the passivation duration of alloys.
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