Abstract

The fracture behavior of Ti_0.45Al_0.55N coatings under uniaxial tension was investigated at different scale levels. The coatings were deposited on 12Cr18Ni9Ti steel substrates by direct current reactive magnetron sputtering. According to molecular dynamics simulation, the nonuniform distribution of aluminum in the coatings affects the initiation and growth of cracks in them. It was found experimentally that the macroscopic fracture of Ti_0.45Al_0.55N coatings on a metal substrate under uniaxial tension occurs in four stages, whose duration is determined by the competition between different stress relaxation mechanisms. The effect of the coating thickness on the development of competing deformation and fracture mechanisms in the coatings is demonstrated.

中文翻译：

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单轴拉伸下 Ti-Al-N 涂层的多尺度断裂

摘要

Ti _0.45 Al _0.55 N 涂层在单轴拉伸下的断裂行为在不同的尺度水平进行了研究。通过直流反应磁控溅射将涂层沉积在12Cr18Ni9Ti钢基材上。根据分子动力学模拟，铝在涂层中的不均匀分布会影响涂层中裂纹的萌生和扩展。实验发现，Ti _0.45 Al _0.55的宏观断口在单轴拉伸下，金属基材上的 N 涂层发生在四个阶段，其持续时间由不同应力松弛机制之间的竞争决定。证明了涂层厚度对涂层中竞争变形和断裂机制发展的影响。