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Effects of Cr-addition and lamellar microstructure on the oxidation behavior of single crystal (Mo0.85Nb0.15)Si2 |
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| Authors: | Ou ZhuLanting Zhang Jinxing YuAidang Shan Jiansheng WuKoji Hagihara Takayoshi Nakano |
| Affiliation: | a School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China b Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, 2-1,Yamada-Oka, Suita, Osaka 565-0871, Japan c Division of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2-1,Yamada-Oka, Suita, Osaka 565-0871, Japan |
| Abstract: | The oxidation behavior of (Mo0.85Nb0.15)Si2 single crystals and the influence of Cr-addition were studied focusing on its microstructure dependence. Cr-addition to single-phase C40-structured (Mo0.85Nb0.15)Si2 crystal induced the formation of crystalline silica, leading to slightly larger weight gain during the oxidation test at 1200 °C. Furthermore, Cr-addition to C40/C11b duplex-phase (Mo0.85Nb0.15)Si2 crystal with lamellar structure strongly suppressed the internal oxidation of the C11b phase, resulting in excellent oxidation resistance. C40/C11b lamellae-structured crystals showed better oxidation resistance than the C40-structured crystals. |
| Keywords: | Transition metal alloys and compounds Oxidation Microstructure |
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