Achieving enhanced toughness of a nanocomposite coating by lattice distortion at the variable metallic oxide interface

Zhen Zhang; Zehui Yang; Weifeng Qian; Yongnan Chen; Yiku Xu; Xiqing Xu; Qinyang Zhao; Hongzhan Li; Yongqing Zhao; Haifei Zhan

Materials & Design (Dec 2022)

Achieving enhanced toughness of a nanocomposite coating by lattice distortion at the variable metallic oxide interface

Zhen Zhang,
Zehui Yang,
Weifeng Qian,
Yongnan Chen,
Yiku Xu,
Xiqing Xu,
Qinyang Zhao,
Hongzhan Li,
Yongqing Zhao,
Haifei Zhan

Affiliations

Zhen Zhang: School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China
Zehui Yang: School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China
Weifeng Qian: School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China
Yongnan Chen: School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China; Corresponding authors at: School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China (Y. Chen; Q. Zhao).
Yiku Xu: School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China
Xiqing Xu: School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China
Qinyang Zhao: School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China; Corresponding authors at: School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China (Y. Chen; Q. Zhao).
Hongzhan Li: Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China
Yongqing Zhao: Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China
Haifei Zhan: Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China; School of Mechanical, Medical and Processing Engineering, Queensland University of Technology (QUT), Brisbane, QLD 4001, Australia; Corresponding authors at: School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China (Y. Chen; Q. Zhao).

Journal volume & issue: Vol. 224
p. 111316

Abstract

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Ceramic coatings are in general a kind of brittle material because they are predominantly made up of ionic crystals that avoid dislocation motion caused by lattice distortion. In this regard, a remarkable toughened ZrO2/MgO nanocomposite coating is obtained by the plasma electrolytic oxidation (PEO) process and in-situ synthesized ZrO2 with quantitative control approach. It is revealed that the toughening behavior of the ZrO2/MgO coating is related to the coordination and diversion of lattice distortion at the metallic oxide interface, which induces distinct dislocation motion at the interface. The semicoherent interface between m-ZrO2 and MgO is verified to act as a buffer to realize toughening of the nanocomposite coating through dislocation slipping induced by lattice coordinated distortion. Simultaneously, significant interfacial lattice distortion transfer and dislocation pinning are discovered at the semicoherent interface between t-ZrO2 and MgO, which are beneficial to toughness enhancement of the nanocomposite coating. The results indicate that the toughening effect occurs along with dislocation slipping and pinning caused by lattice distortion of the ZrO2/MgO semicoherent interface, which enables the toughness of novel nanocomposite coating to reach 2.7 times of the traditional PEO coating.

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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