Effect of Co on microstructure and high temperature oxidation resistance of Ti45Al-8Nb-0.3Y alloy

XIE Xiaoqing; LI Xuan; LYU Wei; LAI Sheng; LIU Yi; LI Jianjun; XIE Wenling

doi:10.11868/j.issn.1001-4381.2021.000116

Cailiao gongcheng (Jan 2022)

Effect of Co on microstructure and high temperature oxidation resistance of Ti45Al-8Nb-0.3Y alloy

XIE Xiaoqing,
LI Xuan,
LYU Wei,
LAI Sheng,
LIU Yi,
LI Jianjun,
XIE Wenling

Affiliations

XIE Xiaoqing: School of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, China
LI Xuan: School of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, China
LYU Wei: School of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, China
LAI Sheng: School of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, China
LIU Yi: Sichuan Aerospace Fiberhome Servo Control Technology Co., Ltd., Chengdu 611130, China
LI Jianjun: Sichuan Aerospace Fiberhome Servo Control Technology Co., Ltd., Chengdu 611130, China
XIE Wenling: School of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, China

DOI: https://doi.org/10.11868/j.issn.1001-4381.2021.000116
Journal volume & issue: Vol. 50, no. 1
pp. 101 – 108

Abstract

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Ti45Al-8Nb-0.3Y-mCo (m=0, 0.5, 1, 2, atom fraction/%) alloys were prepared by vacuum arc non-consumable melting method. The microstructure and high temperature oxidation resistance of the alloys were investigated. The results show that the microstructure of TiAl-Nb alloy can be significantly refined by addition of Co element. However, Co can remarkably inhibit the formation of α2+γ lamellar while promote the formation of Co-rich B2 precipitations in the alloys. The oxide films formed on the Ti45Al-8Nb-0.3Y-mCo alloys mainly consist of relatively loose TiO2 and Al2O3 mixtures, after oxidation at 1000 ℃ for 100 h in air. With the increase of Co content, the mass gains of the TiAl-Nb-0.3Y alloys after oxidation increase obviously, while much better anti-spalling performance of the oxide films can be obtained. Addition of Co can reduce the internal stress of the oxide film to a certain extent, which is beneficial to the anti-spalling performance of the oxide film. However, the coarse B2 precipitation caused by Co weakens high temperature oxidation resistance of the alloy.

Published in Cailiao gongcheng

ISSN: 1001-4381 (Print)
Publisher: Journal of Materials Engineering
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: http://jme.biam.ac.cn/CN/1001-4381/home.shtml

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