对Ti50Ni44Al6和Ti50Ni41Al6Nb3合金在1073 K循环氧化行为的测试表明, Nb的加入显著改善合金的高温抗氧化性能. Ti50Ni44Al6合金在1073 K经过100 h循环氧化后形成外层以TiO2为主并含有少量Al2NiO4、内层为TiNiO3的氧化层,合金的氧化动力学服从线性规律; Ti50Ni41Al6Nb3合金生成以TiO2为主的氧化膜, 在外氧化层下面形成了一层富Nb和Al的复合氧化物, 显著阻碍氧以及合金元素的扩散, 降低了合金的氧化速率,合金高温氧化动力学遵从抛物线规律.
The cyclic oxidation behavior of Ti50Ni44Al6 and Ti50Ni41Al6Nb3 alloys at 1073 K in air have been investigated. The addition of Nb could improve the oxidation resistance of the alloys. During the oxidation of Ti50Ni44Al6 alloy, both internal and external oxidation were observed, forming TiO2/Al2NiO4 and TiNiO3, respectively. The oxidation kinetics of the Ti50Ni44Al6 obeys linear law. After addition of Nb, only external oxidation occurs during the oxidation of Ti50Ni41Al6Nb3, forming an oxide mainly composed of TiO2. The oxidation kinetics obeys parabolic law. The mechanism for the improvement of oxidation by Nb addition was discussed. Nb impedes the inward diffusion of oxygen and the outward diffusion of metallic elements, resulting in a deceleration of the oxidation.
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