The effects of adding Cr and Al on the oxidation behavior of a Ti 5 Si 3 -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 2 (MoO 4 ) 3 and Al 2 (MoO 4 ) 3 in the oxide scales. These protective molybdates mainly formed on the molybdenum solid solution (Mo ss ) and Mo 3 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 2 O 3 and Al 2 O 3 in the oxide scales.

中文翻译：

---

Cr和Al合金化对掺Ti5Si3的MoSiBTiC合金抗氧化性的影响

研究了添加 Cr 和 Al 对掺入 Ti 5 Si 3 的 MoSiBTiC 合金（46Mo-28Ti-14Si-6C-6B，at%）在 800 和 1,100°C 下氧化行为的影响。由于在氧化皮中形成了 Cr 2 (MoO 4 ) 3 和 Al 2 (MoO 4 ) 3 ，Cr和Al的添加大大提高了MoSiBTiC合金在800℃时的抗氧化性。这些保护性钼酸盐主要形成在钼固溶体 (Mo ss ) 和 Mo 3 Si 相上，在不含 Cr 和 Al 的合金中表现出较差的抗氧化性，从而提高了合金的抗氧化性。然而，10Al合金在长期氧化试验后发生加速氧化，表明形成的氧化皮保护能力有限。在 1,100°C 时，