Abstract Low hardness and poor wear resistance are major limitations of Al alloys, which hinder their application in several applications, especially automotive moving parts. DLC can effectively improve hardness and wear resistance of Al alloy, but high residual stress and poor adhesion limit the film thickness. Multilayer thick films (~10 μm) composed of alternating Ti and Ti-DLC layers were successfully deposited on Al alloys. The influence of the Ti content on the microstructure, mechanical and tribological properties of the films were emphasized. As the Ti content decreases from 10.42 to 1.35 at.%, the microstructure evolved from polycrystalline composite film to nanocrystalline composite film, and then to amorphous film. The mechanical and tribological properties of the films depend on the microstructure. The amorphous composite films (Ti > 6.06 at.%) exhibited more excellent wear resistance than polycrystalline composite films (Ti 0.1) than. H3/E⁎2 (>0.2) and elastic recovery (>60%). When the doped Ti content was 6.06 at.%, the nanocrystalline composite multilayer film showed superior comprehensive performance of high hardness (~23 GPa), high elastic recovery (~69%), low friction coefficient (~0.13) and low wear rate (1.0 × 10−7 mm3/Nm).

中文翻译：

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过滤阴极真空电弧技术在铝合金上多层 Ti-DLC 厚膜的显微结构、力学和摩擦学性能

摘要 铝合金硬度低、耐磨性差是其主要局限性，阻碍了其在多种应用中的应用，尤其是汽车运动部件。DLC可有效提高铝合金的硬度和耐磨性，但残余应力高、附着力差限制了薄膜厚度。由交替的 Ti 和 Ti-DLC 层组成的多层厚膜（~10 μm）成功沉积在铝合金上。强调了Ti含量对薄膜微观结构、力学和摩擦学性能的影响。随着 Ti 含量从 10.42 at.% 降低到 1.35 at.%，微观结构从多晶复合膜演变为纳米晶复合膜，再到非晶膜。薄膜的机械和摩擦学性能取决于微观结构。非晶复合薄膜 (Ti > 6.06 at.%) 表现出比多晶复合膜 (Ti 0.1) 更优异的耐磨性。H3/E⁎2 (>0.2) 和弹性恢复 (>60%)。当掺杂Ti含量为6.06 at.%时，纳米晶复合多层膜表现出高硬度（~23 GPa）、高弹性回复（~69%）、低摩擦系数（~0.13）和低磨损率的优异综合性能（ 1.0 × 10−7 mm3/Nm)。