Abstract Aluminum-based metal matrix composites (MMCs) are useful materials for structural applications due to their high strength to weight ratio. In this study, the addition of the rare earth element La to the Al6061 alloys as in-situ La oxide dispersoids fabricated by mechanical alloying was investigated. The result shows that an increase of La content can change the morphology of synthesized powders and has significant influence on microstructure uniformity, hardness, densification, and ductility of the materials. The results also show that the complex La-Al-Si-O oxides and needle-like AlFeSi intermetallic compounds were formed during ball milling and subsequent sintering processes.

中文翻译：

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通过机械合金化原位分散 Al6061 复合材料的 La 氧化物

摘要 铝基金属基复合材料 (MMC) 具有高强度重量比，是结构应用的有用材料。在这项研究中，研究了将稀土元素 La 添加到 Al6061 合金中作为通过机械合金化制造的原位 La 氧化物分散体。结果表明，La含量的增加会改变合成粉末的形貌，对材料的显微组织均匀性、硬度、致密化和延展性有显着影响。结果还表明，在球磨和随后的烧结过程中形成了复杂的 La-Al-Si-O 氧化物和针状 AlFeSi 金属间化合物。