Improvement of the mechanical and tribological properties due to extrusion can be attributed to the improved density and excellent bond strength due to high compressive stress. To avoid the product defects mathematically contoured cosine profiled die was used for the thermomechanical treatment. Improvement of mechanical characterization like density, hardness, compression test and three-point-bend test was inquired. Two body dry sliding wear behaviour of the prepared AMCs before and after extrusion were investigated by using a pin-on-disc wear testing method by varying the variable parameters like load (N), track diameter (mm) and RPM of the counter disc. The effect of hot extrusion on mechanical and tribological characteristics of aluminium matrix composites (AMCs) developed by powder metallurgy route followed by double axial cold compaction and controlled atmospheric sintering was studied. Shearing of the fine distributed graphite particles at the tribosurface acts as a solid lubricant and decreases wear rate. At higher loading and sliding velocity condition a mixed type of wear mechanism was observed.

中文翻译：

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粉末冶金路线开发的热挤压铝基MMC的合成与表征

由于挤出而导致的机械和摩擦学性能的改善可归因于由于高压缩应力而导致的密度提高和优异的粘结强度。为了避免产品缺陷，将数学轮廓余弦轮廓的模具用于热机械处理。要求改善机械性能，如密度，硬度，压缩试验和三点弯曲试验。通过使用销盘式磨损测试方法，通过改变可变参数（例如负载盘的载荷（N），轨道直径（mm）和RPM），研究了制备的AMC在挤出前后的两体干滑磨损行为。研究了热挤压对粉末冶金路线，双轴向冷压和可控气氛烧结开发的铝基复合材料（AMCs）力学和摩擦学特性的影响。摩擦表面处的细分布石墨颗粒的剪切起固体润滑剂的作用，并降低了磨损率。在较高的载荷和滑动速度条件下，观察到混合类型的磨损机理。