Synthesis and corrosion behavior of Mo15Nb20Ta10Ti35V20 refractory high entropy alloy

Yu Gao; Kai Chong; Linjing Qiao; Yuanxiao Li; Chang Liu; Fuqiang Guo; Dongting Wu; Yong Zou

Materials & Design (Apr 2023)

Synthesis and corrosion behavior of Mo15Nb20Ta10Ti35V20 refractory high entropy alloy

Yu Gao,
Kai Chong,
Linjing Qiao,
Yuanxiao Li,
Chang Liu,
Fuqiang Guo,
Dongting Wu,
Yong Zou

Affiliations

Yu Gao: Shenzhen Research Institute of Shandong University, Shenzhen 518063, China; Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan, Shandong 250061, China
Kai Chong: School of Materials Science and Engineering, Shandong University, Jinan, Shandong 250061, China
Linjing Qiao: School of Materials Science and Engineering, Shandong University, Jinan, Shandong 250061, China
Yuanxiao Li: Shandong Institute for Product Quality Inspection, Jinan, Shandong 250102, China
Chang Liu: School of Materials Science and Engineering, Shandong University, Jinan, Shandong 250061, China
Fuqiang Guo: School of Materials Science and Engineering, Shandong University, Jinan, Shandong 250061, China
Dongting Wu: School of Materials Science and Engineering, Shandong University, Jinan, Shandong 250061, China; Corresponding authors.
Yong Zou: Shandong Engineering & Technology Research Center for Modern Welding, Shandong University, Jinan, Shandong 250061, China; Corresponding authors.

Journal volume & issue: Vol. 228
p. 111820

Abstract

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The Mo15Nb20Ta10Ti35V20 refractory high entropy alloy with BCC structure was prepared by vacuum arc melting. The synthesized Mo15Nb20Ta10Ti35V20 demonstrated better corrosion resistance compared to 316 stainless steel in chloride corrosion environment, whose better corrosion resistance is attributed to the complex passive film structure and shows the characteristics of passivation-transpassivation-secondary passivation on the polarization curve. Mott-Schottky curves analysis and XPS results show that the primary and secondary passive films have different P-N junctions which were composed of different oxides showing bilayer structure characteristics. Through the thermodynamic calculation, the relationship between the competitive growth of multiple principal elements in RHEA were analyzed. The dynamic changes of TiO2 and Ti2O3 contents were responsible for the secondary passivation phenomenon.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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