Corrosion and slurry erosion wear performances of coaxial direct laser deposited CoCrFeNiCu1-xMox high-entropy coatings by modulating the second-phase precipitation

Jiakun Wang; Yushan Chen; Yunhua Zhang; Wenying Dai; Qian Xu; Weizhou Li; Yan Liu

Materials & Design (Dec 2021)

Corrosion and slurry erosion wear performances of coaxial direct laser deposited CoCrFeNiCu1-xMox high-entropy coatings by modulating the second-phase precipitation

Jiakun Wang,
Yushan Chen,
Yunhua Zhang,
Wenying Dai,
Qian Xu,
Weizhou Li,
Yan Liu

Affiliations

Jiakun Wang: School of Resources, Environment & Materials, Guangxi University, Nanning 530004, PR China; School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, PR China; Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, PR China
Yushan Chen: School of Resources, Environment & Materials, Guangxi University, Nanning 530004, PR China; Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, PR China
Yunhua Zhang: School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, PR China
Wenying Dai: School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, PR China
Qian Xu: School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, PR China
Weizhou Li: School of Resources, Environment & Materials, Guangxi University, Nanning 530004, PR China; Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, PR China; Corresponding authors.
Yan Liu: School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, PR China; Corresponding authors.

Journal volume & issue: Vol. 212
p. 110277

Abstract

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Developing high-entropy alloy (HEA) coatings with preferable properties for severe environments is a promising and cost-efficient way. In this work, an original HEA CoCrFeNiCu1-xMox coatings were designed on-demand and successfully prepared on duplex stainless steel (DSS) through coaxial direct laser deposition technique. The first-principles calculation based on the density functional theory was employed to calculate the characteristics of materials. The results showed that the uniformly distributed Cu could stabilize the face-centered cubic phase structure, hinder the transfer of point defects, and activate the cathode. The synergistic effect of Mo and other HEA elements was beneficial in reducing the point defect density of the passive film, and an appropriate amount of Mo was contributed to grain refinement, solid solution strengthening, and precipitation strengthening of the coating. When the ratio of Cu to Mo is 1:3, a small number of nanoscales second sigma phase (Fe-Cr-Mo) appeared between ordered and disordered, which balanced the coating's corrosion and slurry erosion wear performances. Compared with DSS, the corrosion current density of CoCrFeNiCu0.25Mo0.75 coating was reduced by nearly an order of magnitude, the impedance was increased by 2.5 times, and the erosion wear resistance was increased by 4 to 5 times.

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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