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金属间化合物Ni_3Al在其熔点(1390℃)以下具长程有序结构,屈服强度随温度升高而增大,很有可能成为新型的高温结构材料。 1979年发现Ni_3Al中加入微量硼可使室温塑性显著提高。近年证实加Zr可进一步改善室温和高温强度,加Cr能减轻或消除动态脆性。高温材料除了需要良好的力学性能外,必须具有优异的抗高温氧化性能。但关于Cr和/或Zr对抗氧化性能的影响,尚未见系统报导。本工作研究Zr和Cr对Ni_3Al合金850～1150℃氧化增重的影响,探讨Ni_3Al合金氧化过程中Cr和Zr的作用。
The intermetallic compound Ni_3Al has a long-range ordered structure below its melting point (1390 ℃), and the yield strength increases with increasing temperature, which is likely to become a new type of high-temperature structural material. Found in 1979, adding a small amount of boron Ni 3 Al can significantly increase the plasticity at room temperature. In recent years confirmed that the addition of Zr can further improve the room temperature and high temperature strength, plus Cr can reduce or eliminate dynamic brittleness. In addition to the need for high-temperature materials, good mechanical properties, it must have excellent high temperature oxidation resistance. However, the impact of Cr and / or Zr on the oxidation resistance has not been systematically reported yet. In this work, the effects of Zr and Cr on oxidation and weight gain of Ni_3Al alloy at 850 ~ 1150 ℃ were studied. The effects of Cr and Zr on the oxidation of Ni_3Al alloy were discussed.