Exploring the effect of layer thickness on the elastoplastic properties of the constituent materials of CrN/CrAlN multilayer coatings: a nanoindentation and finite element-based investigation

IF 2 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Thin Solid Films Pub Date : 2024-11-15 DOI:10.1016/j.tsf.2024.140581

Yamen Ben Ammar , Khalil Aouadi , Aurélien Besnard , Alex Montagne , Corinne Nouveau , Faker Bouchoucha

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Abstract

This paper aims to assess the effect of layer thickness on the elastoplastic properties of the constituent materials of multilayer coating systems, as well as on the stress and strain fields in the vicinity of the coating/substrate interface. A methodology based on a trust-region reflective optimization algorithm, integrated with finite element analysis of the nanoindentation process, is employed to extract the elastoplastic properties of the distinct layers, constituting multilayer coating. This approach is validated on a CrN/CrAlN multilayer coating systems with varying layer thicknesses from 1 to 0.35 µm, by which Young's modulus (E), yield stress (σ_y), and work hardening exponent (n) of each individual coating material layer were obtained. The results revealed a reduction in the hardness and Young's modulus of either CrN, or CrAlN coating layer as the layer thickness decreased. Finite element analysis of the nanoindentation process demonstrated that decreasing the coating layer thickness leads to an increase in the plastic deformation within the coatings, which reduces the stress concentration in this area. The simulation results suggest that an optimum thickness of 0.5 μm of CrAlN and CrN monolayer materials would improve the adhesion properties of CrN/CrAlN multilayer coatings.

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层厚对CrN/CrAlN多层涂层组成材料弹塑性性能的影响：基于纳米压痕和有限元的研究

本文旨在评估层厚对多层涂层系统组成材料弹塑性性能的影响，以及对涂层/基体界面附近应力和应变场的影响。采用基于信任区域反射优化算法的方法，结合纳米压痕过程的有限元分析，提取了构成多层涂层的不同层的弹塑性性能。在厚度为1 ~ 0.35µm的CrN/CrAlN多层涂层体系上验证了该方法，得到了各涂层材料层的杨氏模量(E)、屈服应力（σy）和加工硬化指数(n)。结果表明，随着涂层厚度的减小，CrN和CrAlN涂层的硬度和杨氏模量均有所降低。纳米压痕过程的有限元分析表明，减小涂层厚度导致涂层内部的塑性变形增加，从而降低了该区域的应力集中。仿真结果表明，CrN和CrN单层材料的最佳厚度为0.5 μm，可以提高CrN/CrAlN多层涂层的粘附性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin Solid Films 工程技术-材料科学：膜

CiteScore

4.00

自引率

4.80%

发文量

381

审稿时长

7.5 months

期刊介绍： Thin Solid Films is an international journal which serves scientists and engineers working in the fields of thin-film synthesis, characterization, and applications. The field of thin films, which can be defined as the confluence of materials science, surface science, and applied physics, has become an identifiable unified discipline of scientific endeavor.