An Al–SiC coating was synthesized on Ti–6Al–4 V alloy substrate using the mechanical alloying method. The effects of annealing treatment on the microstructure, the microhardness, the friction and wear resistance and the high-temperature oxidation resistance of the coating were investigated. The results showed that the coating had a composite structure in which the reinforcing SiC particles were evenly dispersed in the Al matrix. Both the surface microhardness and the wear resistance of the substrate improved because of the as-synthesized coating. The oxidation resistance was enhanced because of the formation of an Al3Ti layer and a Ti5Si3-rich layer in the coating during oxidation. Specifically, the coating formed a tri-layer structure during thermal exposure due to the reaction in the coating and interdiffusion between the coating and the substrate. The outer layer had a complex structure, which was comprised of the Al–Si alloy as the matrix and the unevenly distributed SiC and Al4C3. This layer had low microhardness and tended to flake in both friction and oxidation processes. The inner layer was an Al3Ti layer, which had high microhardness and favorable wear resistance, and could protect the substrate from severe oxidation at elevated temperature. A Ti5Si3-rich interlayer between the inner layer and the substrate formed in the initial annealing process and could further retard the inward diffusion of oxygen during oxidation.

中文翻译：

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退火处理对机械合金化法在Ti-6Al-4V合金基体上合成的SiCp/Al涂层组织、力学性能和抗氧化性的影响

使用机械合金化方法在 Ti-6Al-4 V 合金基体上合成了 Al-SiC 涂层。研究了退火处理对涂层显微组织、显微硬度、摩擦磨损性能和高温抗氧化性能的影响。结果表明，涂​​层具有复合结构，其中增强的 SiC 颗粒均匀地分散在 Al 基体中。由于合成涂层，基体的表面显微硬度和耐磨性均得到改善。由于在氧化过程中在涂层中形成了 Al3Ti 层和富含 Ti5Si3 的层，从而增强了抗氧化性。具体来说，由于涂层中的反应以及涂层与基材之间的相互扩散，涂层在热暴露期间形成三层结构。外层结构复杂，由Al-Si合金为基体和不均匀分布的SiC和Al4C3组成。该层具有低显微硬度并且在摩擦和氧化过程中趋于剥落。内层为Al3Ti层，具有较高的显微硬度和良好的耐磨性，在高温下可以保护基体免受严重氧化。在初始退火过程中形成的内层和衬底之间的富含 Ti5Si3 的夹层可以进一步阻止氧化过程中氧的向内扩散。它由作为基体的 Al-Si 合金和不均匀分布的 SiC 和 Al4C3 组成。该层具有低显微硬度并且在摩擦和氧化过程中趋于剥落。内层为Al3Ti层，具有较高的显微硬度和良好的耐磨性，在高温下可以保护基体免受严重氧化。在初始退火过程中形成的内层和衬底之间的富含 Ti5Si3 的夹层可以进一步阻止氧化过程中氧的向内扩散。它由作为基体的 Al-Si 合金和不均匀分布的 SiC 和 Al4C3 组成。该层具有低显微硬度并且在摩擦和氧化过程中趋于剥落。内层为Al3Ti层，具有较高的显微硬度和良好的耐磨性，在高温下可以保护基体免受严重氧化。在初始退火过程中形成的内层和衬底之间的富含 Ti5Si3 的夹层可以进一步阻止氧化过程中氧的向内扩散。