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【轻有色合金】Y对Ti-45Al-6Nb合金组织结构和高温氧化性能的影响
发布时间:2020-09-15 文章来源:本站原创
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黄 波1 李 轩1,2 谢小青1 谢文玲1 柳忠彬1

(1.四川轻化工大学机械工程学院; 2.人工智能四川省重点试验室)

要:研究了Y对电弧熔炼Ti-45Al-6Nb合金组织结构和高温氧化性能的影响。结果表明,不同Y含量的Ti-45Al-6Nb合金均主要由γ+α2片层组织、B2析出相和少量Y2O3组成,微量Y对合金的相组成没有明显的影响,但能够显著细化合金的α2+γ片层组织。高温氧化结果表明,Y能够明显改善Ti-45Al-6Nb合金的高温抗氧化性能,且Y含量为0.3%时效果更优:Ti-45Al-6Nb0.3Y合金在1 000 空气中的氧化速率为3.26×10-2 mg2/(cm4 ·h),分别是Y含量为0.1%0.9%时合金氧化速率的41.3%26.1%,较不含Y合金低约1个数量级。

关键词:Ti-45Al-6Nb合金;Y改性;高温氧化;氧化膜;氧化动力学

中图分类号:TG294TG146.23;TB35  文献标志码A

DOI10.15980/j.tzzz.2020.08.027


Effects of Yttrium on the Microstructure and High Temperature Oxidation Behavior of Ti-45Al-6Nb Alloys

Huang Bo1, Li Xuan1,2, Xie Xiaoqing1, Xie Wenling1, Liu Zhongbin1

(1.School of Mechanical Engineering, Sichuan University of Science and Engineering; 2.Artificial Intelligence Laboratory of Sichuan Province)

Abstract: Effects of yttrium on the microstructure and high temperature oxidation behavior of arc melted Ti-45Al-6Nb alloys were investigated. The results show that the obtained Ti-45Al-6Nb alloys with different yttrium are mainly composed of γ2 lamellar, B2 precipitate and a small amount of Y2O3. Addition of trace yttrium in the alloy can be ingored for influence on the phase composition of the alloys, however, it can significantly refine α2+γ lamellar structure. High temperature oxidation results show that addition of trace yttrium in Ti-45Al-6Nb alloys can significantly improve the oxidation resistance, especially for the alloy with yttrium concentration of 0.3%. The Ti-45Al-6Nb-0.3Y alloy has an oxidation rate constant of 3.26×10-2 mg2/(cm4·h) at 1 000 in air, which is account for 41.3% and 26.1% of the alloys with yttrium concentrations of 0.1% and 0.9%, respectively, and about 1 order of magnitude lower than that of the alloy without yttrium addition.

Key Words: Ti-45Al-6Nb Alloy, Y Modification, High Temperature Oxidation, Oxide Film, Oxidation Kinetics



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