چكيده به لاتين
This study aimed to investigate the tribological properties of copper-graphene nanocomposite produced by the accumulative roll bonding. In this research, for the fabrication of copper-graphene nanocomposite, with rolling conditions including the percentage of thickness changes of 50% per cycle has been used. To investigate the tribological properties of the composite, a pin wear test on a disk was used. The samples of the composites were weighed after weighing the surface, before, and after the abrasion test by a scale with an accuracy of 0.01 g. Were compared. The results showed that with increasing the number of cycles, the rate of weight loss, wear rate, and the average coefficient of friction in terms of distance traveled for composites increased, in other words, the wear resistance of composites decreased with the increasing number of cycles, and this amount Compared to the pure sample, at first, these properties decreased significantly and improved well, but with the increasing number of cycles, the improving and resistance behavior of these composites decreased; For the 6 rolled cycle sample, lower wear resistance was observed than the pure copper sample. Field emission scanning electron microscopy (FE-SEM) was used to investigate the wear level and wear particles obtained from the wear test and to determine the wear mechanism of the composites. The results were that in all rolled samples, 4 different models of abrasion mechanism occurred, which are: adhesive abrasion mechanism, lamination, oxidation, and abrasion. Studies have shown that with increasing the number of cycles in composites, the important and main mechanism of these composites has changed to lamination and the amount and areas of lamination in composites have increased, and the amount of oxidation and adhesion mechanism has increased
