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Microstructure and oxidation behavior of the CrMoNbTaV high-entropy alloy

Published online by Cambridge University Press:  19 October 2018

Yifeng Xiao ,
Wenhui Kuang ,
Yanfei Xu ,
Liang Wu ,
Wenjuan Gong ,
Jinwen Qian ,
Qiankun Zhang  and
Yuehui He
Yifeng Xiao
Affiliation:
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People’s Republic of China; Key Laboratory of Welding Robot and Application Technology of Hunan Province, Xiangtan University, Xiangtan 411105, People’s Republic of China; and Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education, Xiangtan University, Xiangtan 411105, People’s Republic of China
Wenhui Kuang
Affiliation:
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People’s Republic of China; Key Laboratory of Welding Robot and Application Technology of Hunan Province, Xiangtan University, Xiangtan 411105, People’s Republic of China; and Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education, Xiangtan University, Xiangtan 411105, People’s Republic of China
Yanfei Xu*
Affiliation:
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People’s Republic of China; Key Laboratory of Welding Robot and Application Technology of Hunan Province, Xiangtan University, Xiangtan 411105, People’s Republic of China; and Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education, Xiangtan University, Xiangtan 411105, People’s Republic of China
Liang Wu
Affiliation:
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People’s Republic of China; Key Laboratory of Welding Robot and Application Technology of Hunan Province, Xiangtan University, Xiangtan 411105, People’s Republic of China; and Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education, Xiangtan University, Xiangtan 411105, People’s Republic of China
Wenjuan Gong
Affiliation:
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People’s Republic of China; Key Laboratory of Welding Robot and Application Technology of Hunan Province, Xiangtan University, Xiangtan 411105, People’s Republic of China; and Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education, Xiangtan University, Xiangtan 411105, People’s Republic of China
Jinwen Qian
Affiliation:
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People’s Republic of China; Key Laboratory of Welding Robot and Application Technology of Hunan Province, Xiangtan University, Xiangtan 411105, People’s Republic of China; and Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education, Xiangtan University, Xiangtan 411105, People’s Republic of China
Qiankun Zhang
Affiliation:
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, People’s Republic of China; Key Laboratory of Welding Robot and Application Technology of Hunan Province, Xiangtan University, Xiangtan 411105, People’s Republic of China; and Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education, Xiangtan University, Xiangtan 411105, People’s Republic of China
Yuehui He
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: yioffice123@126.com
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Abstract

The microstructure and oxidation behavior at high temperatures ranging from 900 °C to 1100 °C of equiatomic CrMoNbTaV high-entropy alloy produced by vacuum arc melting were investigated. The phase component, microstructure, and microhardness of the alloy were examined by using X-ray diffraction, scanning electron microscopy equipped with an energy-dispersive X-ray spectroscope, and Vickers hardness tests, respectively. The as-cast alloy consists of a single body-centered cubic (BCC) refractory metal solid solution due to the high mixing entropy effect and exhibits a dendritic microstructure. The alloy has a very high microhardness value of 923 HV due to the strong solid solution strengthening effect. The average microhardness in interdendrites (950 HV) was higher than that in dendrites (896 HV) because of composition segregation. The oxidation kinetic curves of the alloy after exposure to air at 900 and 1000 °C follow the pseudo-parabolic rate law, while the mass gain increases first and then decreases at 1100 °C. The thickness of the oxide layer increases with the increasing of oxidation time. The long rod-shaped oxidation products are composed of Nb2O5, NbO2, CrTaO4, CrNbO4, Ta9VO25, Nb9VO25, and TaO after oxidation at 900 and 1000 °C for 25 h. The oxides of CrTaO4 and CrNbO4 disappear as the oxidation temperature elevated to 1100 °C.

Keywords

high-entropy alloyrefractorymicrostructureoxidation behavior
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 2 , 28 January 2019 , pp. 301 - 308
Copyright
Copyright © Materials Research Society 2018 

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