High-temperature oxidation resistance of Ti-45Al-8 (Nb, Hf, Y)-0.2B alloys

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作者：
Wang, Yanjing [1 ]
Li, Fei [1 ]
Gu, Yanpeng [1 ]
Wang, Jijie [1 ]
Du, Xinghao [1 ]
机构：
[1] Shenyang Aerospace University, Shenyang,110136, China
来源：
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2016年 / 45卷 / 01期
关键词：
Three kinds of alloys were designed by making the niobium equivalent of 8 at% approximately; and the compositions of the alloys were Ti-45Al-8Nb-0.2B; Ti-45Al-7Nb-0.1Hf-0.1Y-0.2B as well as Ti-45Al-4Nb-0.5Hf-0.1Y-0.2B (at%). The interrupted oxidation behaviors of alloys at 900℃ in static air were studied. The results show that combined addition of Hf and Y can enhance adherence between the oxide film and the substrate; Ti-45Al-4Nb-0.5Hf-0.1Y-0.2B alloy with the low Nb/Hf ratio has a lower oxidation gain and strong oxidation resistance. Ti-45Al-7Nb-0.1Hf-0.1Y-0.2B alloy with the high Nb/Hf ratio has a higher oxidation gain and poor oxidation resistance. Oxidized samples were examined by scanning electron microscopy (SEM); energy dispersive X-ray analysis (EDX) and X-ray diffraction analysis (XRD). It is found that combined addition of Hf and Y can promote the whisker growth of Al2O3 oxide scale; which improves adherence of the oxide film; a large number of continuous and compact Al2O3 oxide scale has been found in the alloys with low Nb/Hf ratio; which improves oxidation resistance of the alloy; external oxidation in the alloy with high Nb/Hf ratio results in higher oxidation gain and poor oxidation resistance. © 2016; Science Press. All right reserved;
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