The aim of the present study is to investigate the structural, wear and thermal behaviour of Cu–Al2O3–graphite hybrid metal matrix composites. Copper matrix composites with Al2O3–graphite reinforcement (0.5-0.5, 1.0-1.0, 1.5-1.5 and 2.0-2.0 wt%) were prepared by stir casting process. Phase, microstructure, density, hardness, wear, compressive strength and specific heat of prepared samples have been investigated. X-ray diffraction revealed that there is no intermediate phase formation between matrix and reinforcement phase as a result of interfacial bonding between them. Microstructure study shows the uniform distribution of Al2O3–graphite particles in the Cu-matrix. Density and hardness were found to decrease with increase in reinforcements percentage whereas the compressive strength was found to increase as the amount of reinforcements was increased. Composite containing 2.0 wt% reinforcements showed the maximum resistance to wear. Specific heat was found to increase with addition of reinforcements; however, this increase was very marginal. Structural, wear and thermal properties of these Cu matrix-based hybrid metal matrix composites were found to be dependent on the reinforcements concentration. It is expected that the present composite will be useful for heat exchanger and heat sink applications.

中文翻译：

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Cu-Al2O3-石墨混合金属基复合材料的结构、磨损和热行为

本研究的目的是研究 Cu-Al2O3-石墨混合金属基复合材料的结构、磨损和热行为。通过搅拌铸造工艺制备了具有 Al2O3-石墨增强体（0.5-0.5、1.0-1.0、1.5-1.5 和 2.0-2.0 wt%）的铜基复合材料。研究了制备样品的物相、微观结构、密度、硬度、磨损、抗压强度和比热。X 射线衍射表明基体和增强相之间没有由于它们之间的界面结合而形成中间相。微观结构研究表明，Al2O3-石墨颗粒在 Cu 基体中分布均匀。发现密度和硬度随着增强材料百分比的增加而降低，而抗压强度随着增强材料数量的增加而增加。含有 2.0 wt% 增强材料的复合材料表现出最大的耐磨性。发现比热随着添加增强材料而增加；然而，这种增加是非常微不足道的。发现这些基于铜基的混合金属基复合材料的结构、磨损和热性能取决于增强材料的浓度。预计本复合材料可用于热交换器和散热器应用。发现这些基于铜基的混合金属基复合材料的磨损和热性能取决于增强材料的浓度。预计本复合材料可用于热交换器和散热器应用。发现这些基于铜基的混合金属基复合材料的磨损和热性能取决于增强材料的浓度。预计本复合材料可用于热交换器和散热器应用。