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A combined experimental and first-principle study on the effect of plasma surface Ta–W co-alloying on the oxidation behavior of γ-TiAl at 900 °C

Published online by Cambridge University Press:  07 February 2020

Dongbo Wei Open the ORCID record for Dongbo Wei [Opens in a new window] ,
Fengkun Li ,
Shuqin Li ,
Shiyuan Wang ,
Feng Ding ,
Hongxuan Liang ,
Yuqin Yan  and
Pingze Zhang
Dongbo Wei*
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China; and Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China
Fengkun Li*
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China
Shuqin Li
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China
Shiyuan Wang
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China
Feng Ding
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China
Hongxuan Liang
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China
Yuqin Yan
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China
Pingze Zhang
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China
*
a)Address all correspondence to these authors. e-mail: weidongbo@nuaa.edu.cn
b)e-mail: lifengkun@nuaa.edu.cn
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Abstract

Ta–W co-alloying was realized by double glow plasma surface metallurgy technology, and their effects on high-temperature oxidation behavior of γ-TiAl were studied. Ta–W co-alloying coating was composed of a deposited layer and interdiffusion layer. The results of isothermal oxidation experiment indicated that a compact mixed oxide film of Ta and W was formed on the sample. The interdiffusion layer reduced the oxygen intrusion that improved the high-temperature oxidation resistance of γ-TiAl. The effects of Ta–W co-alloying on oxygen adsorption energy and electronic structure of γ-TiAl(111) were analyzed by first-principle calculation. The results showed that the optimal adsorption sites of O atoms changed from fcc-Al to hcp-Ti and hcp-Al, indicating that Ta–W co-alloying inhibited the diffusion of O. The electronic structure analysis of γ-TiAl(111) after Ta–W alloying indicated the affinity of Ti and O was inhibited, which resulted in decreased TiO2 in the oxide film.

Keywords

alloyoxidationsimulation
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 5: Focus Issue: The Science and Technology of Vapor Phase Processing and Modification of Surfaces , 16 March 2020 , pp. 516 - 526
Copyright
Copyright © Materials Research Society 2019

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