Abstract

Abrasive wear behaviour of TiB₂ reinforced in-situ magnesium RZ5 alloy-based metal matrix composites was investigated using a pin-on-disc wear testing apparatus. The in-situ RZ5/TiB₂ composite was synthesized through the self-propagating high-temperature synthesis route. The microstructure of the composite revealed a near-uniform distribution of TiB₂ in magnesium matrix. The abrasive wear behaviour on the base RZ5 alloy and TiB₂ reinforced composites were investigated in terms of weight loss and co-efficient of friction. The effect of varying applied load (10–30 N), sliding distance (1000–3000 m), and wt% of TiB₂ content on abrasive wear properties were analysed. The results indicated a higher wear loss of the materials with increase in the applied load and sliding distance. Co-efficient of friction decreased with increase in the applied load but increased with increase in sliding distance. The morphology of the worn surface under different test conditions was analysed in terms of delamination, wear groove, oxide, and wear debris formation using field emission scanning electron microscope. Large flaky shape wear debris was noticed when the load applied is 30 N whereas equiaxed wear debris was noticed when the applied load is 10 N. Increase in sliding distance increased the contact temperature led to the formation of the oxide layer on the contact surface.

Graphic Abstract

中文翻译：

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TiB 2增强原位合成镁RZ5合金基金属基复合材料的磨料磨损行为

摘要

使用针盘式磨损测试设备研究了TiB ₂增强的原位镁RZ5合金基金属基复合材料的磨损性能。通过自蔓延高温合成路线合成了原位RZ5 / TiB ₂复合材料。复合材料的微观结构表明，TiB ₂在镁基体中的分布接近均匀。根据重量损失和摩擦系数，研究了基础RZ5合金和TiB ₂增强复合材料的磨料磨损行为。变化的施加载荷（10–30 N），滑动距离（1000–3000 m）和TiB _2的wt％的影响分析了含量对磨料磨损性能的影响。结果表明，随着施加载荷和滑动距离的增加，材料的磨损损耗更高。摩擦系数随施加载荷的增加而减小，但随滑动距离的增加而增大。使用场发射扫描电子显微镜分析了在不同测试条件下的磨损表面形态，包括分层，磨损槽，氧化物和磨损碎屑的形成。当施加的负载为30 N时，会发现大片状的磨损碎片，而当施加的负载为10 N时，会发现等轴磨损的碎片。滑动距离的增加会增加接触温度，从而导致在接触面上形成氧化层。

图形摘要