摘要
对Ti_(50)Ni_(44)Al_6和Ti_(50)Ni_(41)Al_6Nb_3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．Ti_(50)Ni_(44)Al_6合金在1073 K经过100h循环氧化后形成外层以TiO_2为主并含有少量Al_2NiO_4、内层为TiNiO_3的氧化层,合金的氧化动力学服从线性规律；Ti_(50)Ni_(41)Al_6Nb_3合金生成以TiO_2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 behaviors of Ti50Ni44Al6 and Ti50Ni41Al6Nb3 alloys at 1073 K in air showed that the addition of Nb could improve the oxidation resistance of the alloys. After 100 h oxidation the outer oxide scale of Ti50Ni44Al6 alloy consists of TiO2 and a few of Al2NiO4, and the internal scale is TiNiO3. The oxidation kinetics of the Ti50Ni44Al6 alloy obeys a linear law. For the TisoNi41Al6Nb3 alloy under the same oxidation condition, the oxide scale mainly consisted of TiO2 as well as Nb, Al riched complex oxide beneath the TiO2 layer, and the oxidation kinetics obeys parabolic law. The improvement of the oxidation by Nb addition results from that the Nb, Al complex oxide impedes the inward diffusion of oxygen and outward diffusion of metallic elements, which decreases the oxidation rate of the Nb containing alloy.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第8期820-826,共7页
Acta Metallurgica Sinica
基金
教育部留学回国人员科研启动基金
