In this paper, the performance evaluation of Al-graphene nanoplatelets (GNP) composites surface engineered by a modified friction stir processing (FSP) is reported. Here, multiple micro channels (MCRF) are used to incorporate GNPs in the aluminium matrix instead of a single large groove (SCRF) that is usually used in conventional FSP. With the MCRF approach, ~ 18% higher peak temperature (compared to SCRF) was observed owing to the presence of aluminium sandwiched between consecutive microgrooves and higher heat accumulation in the stir zone. The MCRF approach have significantly reduced the coefficient of friction and wear rates of the processed composites by ~ 14% and ~ 57%, respectively as compared to the SCRF approach. The proposed reinforcement filling method significantly improves the particle dispersion in the matrix, which in turn changes the adhesion mode of wear in SCRF to abrasive mode in MCRF fabricated composites. The uniformly squeezed out GNP tribolayer prevented the direct metal to metal contact between composite and its counterpart which have effectively reduced the deterioration rates.

本文报道了通过改进的摩擦搅拌工艺（FSP）对铝石墨烯纳米片（GNP）复合材料表面工程性能的评价。在这里，使用多个微通道（MCRF）将GNP掺入铝基体中，而不是通常在常规FSP中使用的单个大槽（SCRF）。使用MCRF方法时，由于铝夹在连续的微槽之间，并且在搅拌区有较高的热量积聚，因此观察到的峰值温度比SCRF高出约18％。与SCRF方法相比，MCRF方法已将复合材料的摩擦系数和磨损率分别降低了约14％和57％。所提出的增强填充方法显着改善了颗粒在基体中的分散性，这又将SCRF中磨损的粘附模式更改为MCRF制成的复合材料中的磨蚀模式。均匀挤出的GNP摩擦层可防止复合材料与其对应物之间直接的金属接触，从而有效降低了劣化率。