| Title: |
High-Temperature Oxidation of NbTi-Bearing Refractory Medium- and High-Entropy Alloys. |
| Authors: |
Lin, Wei-Chih1,2,3 (AUTHOR), Lien, Yi-Wen1 (AUTHOR), Moreau, Louis Etienne4,5 (AUTHOR), Murakami, Hideyuki4,5 (AUTHOR), Lo, Kai-Chi1,3 (AUTHOR), Gorsse, Stéphane2 (AUTHOR) stephane.gorsse@icmcb.cnrs.fr, Yeh, An-Chou1,3 (AUTHOR) stephane.gorsse@icmcb.cnrs.fr |
| Source: |
Materials (1996-1944). Sep2024, Vol. 17 Issue 18, p4579. 18p. |
| Subject Terms: |
*WEIGHT gain, *CHROMIUM oxide, *ALLOYS, *OXIDATION, *REFRACTORY materials |
| Abstract: |
The oxidation of six NbTi-i refractory medium- and high-entropy alloys (NbTi + Ta, NbTi + CrTa, NbTi + AlTa, NbTi + AlMo, NbTi + AlMoTa and NbTi + AlCrMo) were investigated at 1000 °C for 20 h. According to our observation, increased Cr content promoted the formation of protective CrNbO4 and Cr2O3 oxides in NbTi + CrTa and NbTi + AlCrMo, enhancing oxidation resistance. The addition of Al resulted in the formation of AlTi-rich oxide in NbTi + AlTa. Ta addition resulted in the formation of complex oxides (MoTiTa8O25 and TiTaO4) and decreased oxidation resistance. Meanwhile, Mo's low oxygen solubility could be beneficial for oxidation resistance while protective Cr2O3/CrNbO4 layers were formed. In NbTi + Ta, NbTi + AlTa and NbTi + CrTa, a considerable quantity of Ti-rich oxide was observed at the interdendritic region. In NbTi + AlCrMo, the enrichment of Cr and Ti at the interdendritic region could fasten the rate of oxidation. Compared to the recent research, NbTi + AlCrMo alloy is a light-weight oxidation-resistant alloy (weight gain of 1.29 mg/cm2 at 1000 °C for 20 h and low density (7.2 g/cm3)). [ABSTRACT FROM AUTHOR] |
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