Modeling the effects of individual layer thickness and orientation on the tribocorrosion behavior of Al/Cu nanostructured metallic multilayers
Modeling the effects of individual layer thickness and orientation on the tribocorrosion behavior of Al/Cu nanostructured metallic multilayers
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DOI：
10.1016/j.wear.2021.203849
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发表时间：
2021-03
期刊：
影响因子：
5
通讯作者：
Kaiwen Wang;W. Cai
中科院分区：
文献类型：
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作者：
Kaiwen Wang;W. Cai
纳米结构金属多层 (NMM) 是一种新兴材料，具有优异的机械、摩擦和腐蚀性能，使其成为在极端条件下使用的理想选择。与许多传统金属和合金相比，NMM 的高耐磨性和耐腐蚀性能增强了耐摩擦腐蚀性能。在这项工作中，开发了一个多物理场有限元模型来研究磨损、腐蚀及其协同作用引起的摩擦腐蚀过程中的材料变形和退化。具体来说，该模型考虑了磨损期间的弹塑性机械变形以及磨损后暴露的内层之间的电偶腐蚀。研究了单层厚度（10 至 100 nm）和层方向（水平和垂直排列）对 Al/Cu NMM 摩擦腐蚀行为的影响。研究发现这两个因素都会影响表面下应力和塑性应变分布以及局部表面腐蚀动力学，从而影响总体摩擦腐蚀速率。该模型和所获得的理解可以为未来 NMM 的摩擦腐蚀设计和优化策略提供启示。
Nanostructured metallic multilayers (NMMs) are emerging materials with excellent mechanical, tribological, and corrosion properties, making them ideal candidates to be used under extremely conditions. The high wear and corrosion resistance lead to enhanced tribocorrosion resistance of NMMs compared to many traditional metals and alloys. In this work, a multiphysics finite element model was developed to study the material deformation and degradation during tribocorrosion from wear, corrosion, as well as their synergy. Specifically, this model accounts for elastic-plastic mechanical deformation during wear and galvanic corrosion between exposed inner layers after wear. The effects of individual layer thickness (from 10 to 100 nm) and layer orientation (horizontally and vertically aligned) on the tribocorrosion behavior of Al/Cu NMMs was studied. Both factors were found to affect the subsurface stress and plastic strain distribution and localized surface corrosion kinetics, hence affecting the overall tribocorrosion rate. This model and the obtained understanding could shed light on future design and optimization strategies of NMMs against tribocorrosion.