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本文研究了不同含量混合 RE 和 Ce 对 Ni_3Al-B 和 Ni_3Al-B-Cr-Zr 合金在1050℃,0.1MPa 下氧化行为的影响,以及混合 RE 对 Ni_3Al-B-Cr-Zr 合金不同温度下瞬时拉伸性能的影响。结果表明,合金中加入少量的稀土元素,促进 Al_2O_3形核,加速致密氧化膜形成,提高合金的抗氧化性。混合 RE 以固溶方式进入氧化膜,细化 NiO 和 Al_2O_3晶粒,增加塑性,不易剥落。少量 Ce 加入 Ni_3Al-B-Cr-Zr 合金,有利于形成细小密集“树根状”氧化物,使氧化膜紧密粘附在基体金属表面。加入0.1%RE 使Ni_3Al-B-Cr-Zr 合金低温抗张强度升高,对塑性影响不大,但对高温强度和塑性有害。
The effects of RE and Ce on the oxidation behavior of Ni_3Al-B and Ni_3Al-B-Cr-Zr alloys at 1050 ℃ and 0.1MPa were investigated. The effects of RE on the thermal stability of Ni_3Al-B-Cr-Zr alloys at different temperatures Tensile properties. The results show that a small amount of rare earth elements are added to the alloy to promote the nucleation of Al 2 O 3, accelerate the formation of dense oxide film and improve the oxidation resistance of the alloy. Mixed RE into the oxide film in solid solution, refined NiO and Al_2O_3 grains, increase plasticity, not easy to peel off. A small amount of Ce added to the Ni_3Al-B-Cr-Zr alloy is conducive to the formation of small dense “tree-like” oxides, the oxide film closely adheres to the substrate metal surface. Addition of 0.1% RE increased the tensile strength of Ni_3Al-B-Cr-Zr alloy at low temperature, but had little effect on ductility but detrimental to high temperature strength and plasticity.