Abstract Present work describes the development of Al-Si/sillimanite reinforced composites via stir casting route. Sillimanite is abundant mineral available in coastal regions of India and has not been explored much as reinforced mineral for the development of composites. In the present work, dry sliding wear behaviour of LM30 aluminium alloy reinforced with sillimanite has been investigated. Composites reinforced with sillimanite in different weight percentage (3–18 wt percentage) and particle size range (fine: 1–20 µm, medium: 32–50 µm, and coarse: 75–106 µm) were prepared. Microstructural studies revealed uniform distribution of sillimanite particles in the matrix of composites. Nanoindentation taken at different phases indicated good bonding between reinforced particles and matrix. Fine particles (1–20 µm) reinforced composites containing 15 wt% sillimanite exhibited higher wear resistance which is 55% more compared to base LM30 alloy. Beyond this reinforcement level, wear resistance deteriorated because of agglomeration of the fine particles. Analysis of wear track and debris revealed that at low applied loads, abrasive wear was predominant whereas at higher applied loads, adhesive wear was dominating factor.

中文翻译：

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粒径对硅线石增强铝基复合材料干滑动磨损行为的影响

摘要 目前的工作描述了通过搅拌铸造工艺开发铝硅/硅线石增强复合材料。硅线石是印度沿海地区丰富的矿物，尚未作为用于开发复合材料的增强矿物进行过多的探索。在目前的工作中，研究了硅线石增强 LM30 铝合金的干滑动磨损行为。制备了不同重量百分比（3-18 重量百分比）和粒度范围（细：1-20 微米，中：32-50 微米，粗：75-106 微米）的硅线石增强复合材料。微观结构研究揭示了复合材料基体中硅线石颗粒的均匀分布。在不同阶段进行的纳米压痕表明增强颗粒和基体之间的结合良好。含有 15 wt% 硅线石的细颗粒 (1–20 µm) 增强复合材料表现出更高的耐磨性，与基础 LM30 合金相比，耐磨性高出 55%。超过该增强水平，由于细颗粒的团聚，耐磨性变差。磨损轨迹和碎屑的分析表明，在低应用载荷下，磨料磨损占主导地位，而在高应用载荷下，粘着磨损是主要因素。