Abstract Although the parts produced by selective laser melting (SLM) are reported to possess comparable or better mechanical properties than the traditionally processed counterparts, the SLM-produced parts demonstrate slightly unfavorable corrosion resistance properties compared with their traditional counterparts. This work shows that, in addition to rapid manufacturing of parts, SLM can effectively refine the grains of eutectic Al-12Si alloy. The SLM-produced Al-12Si shows an ultrafine-grained microstructure and improved corrosion resistance, which provides an innovative and efficient approach to refine the silicon particles in eutectic Al-12Si alloy. Unlike the microstructured Al-12Si alloy manufactured by traditional casting, the SLM-produced Al-12Si alloy contains ultrafine-grained eutectic silicon particles distributing in the aluminum substrate. Importantly, it is found that the SLM-produced Al-12Si alloy possesses superior corrosion resistance than the cast Al-12Si alloy in terms of the results from electrochemical methods and weight loss test. The favorable corrosion resistance of SLM-produced Al-12Si is attributed to these ultrafine silicon particles, which prominently benefits for the formation of the oxide film. The influence of the microstructure with regard to eutectic silicon particles size on the corrosion resistance has also been discussed in depth.

中文翻译：

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激光选区熔化制备超细晶共晶Al-12Si合金腐蚀行为的改善

摘要 尽管据报道，选择性激光熔化 (SLM) 生产的零件与传统加工的零件相比具有相当或更好的机械性能，但 SLM 生产的零件与传统零件相比，其耐腐蚀性能略差。这项工作表明，除了快速制造零件外，SLM 还可以有效地细化共晶 Al-12Si 合金的晶粒。SLM 生产的 Al-12Si 显示出超细晶粒微观结构和改进的耐腐蚀性，这为细化共晶 Al-12Si 合金中的硅颗粒提供了一种创新和有效的方法。与传统铸造制造的微结构 Al-12Si 合金不同，SLM 生产的 Al-12Si 合金含有分布在铝基板中的超细晶粒共晶硅颗粒。重要的是，根据电化学方法和失重测试的结果，发现 SLM 生产的 Al-12Si 合金比铸造的 Al-12Si 合金具有更好的耐腐蚀性。SLM 生产的 Al-12Si 的良好耐腐蚀性归因于这些超细硅颗粒，这显着有利于氧化膜的形成。还深入讨论了微观结构对共晶硅颗粒尺寸对耐腐蚀性的影响。SLM 生产的 Al-12Si 的良好耐腐蚀性归因于这些超细硅颗粒，这显着有利于氧化膜的形成。还深入讨论了微观结构对共晶硅颗粒尺寸对耐腐蚀性的影响。SLM 生产的 Al-12Si 的良好耐腐蚀性归因于这些超细硅颗粒，这显着有利于氧化膜的形成。还深入讨论了微观结构对共晶硅颗粒尺寸对耐腐蚀性的影响。