Effect of Cr and Al alloying on the oxidation resistance of a Ti<sub>5</sub>Si<sub>3</sub>-incorporated MoSiBTiC alloy

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  • Xi Nan
    Department of Materials Science, Graduate School of Engineering, Tohoku University , Sendai , 980-8579 , Japan
  • Tomotaka Hatakeyama
    International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS) , 1-2-1 Sengen, Tsukuba , Ibaraki , 305-0047 , Japan
  • Shuntaro Ida
    Department of Materials Science, Graduate School of Engineering, Tohoku University , Sendai , 980-8579 , Japan
  • Nobuaki Sekido
    Department of Materials Science, Graduate School of Engineering, Tohoku University , Sendai , 980-8579 , Japan
  • Kyosuke Yoshimi
    Department of Materials Science, Graduate School of Engineering, Tohoku University , Sendai , 980-8579 , Japan

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<jats:title>Abstract</jats:title> <jats:p>The effects of adding Cr and Al on the oxidation behavior of a Ti<jats:sub>5</jats:sub>Si<jats:sub>3</jats:sub>-incorporated MoSiBTiC alloy (46Mo–28Ti–14Si–6C–6B, at%) were investigated at 800 and 1,100°C. The addition of Cr and Al largely improved the oxidation resistance of the MoSiBTiC alloy at 800°C due to the formation of Cr<jats:sub>2</jats:sub>(MoO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub> and Al<jats:sub>2</jats:sub>(MoO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub> in the oxide scales. These protective molybdates mainly formed on the molybdenum solid solution (Mo<jats:sub>ss</jats:sub>) and Mo<jats:sub>3</jats:sub>Si phases that show poor oxidation resistance in the Cr- and Al-free alloy and consequently increased the oxidation resistance of the alloys. However, accelerated oxidation occurred on the 10Al alloy after the long-term oxidation test, suggesting that the formed oxide scale has limited protection ability. At 1,100°C, the addition of Cr and Al also enhanced the oxidation resistance to some extent by forming Cr<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> in the oxide scales.</jats:p>

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