Effect of Processing Parameters and Temperature on Sliding Wear of H62 Copper Alloy Modified by Friction Stir Surface Processing

Abstract

H62 copper alloy surface was modified by friction stir processing using various values of processing parameters. The friction and wear experiments of surfaces were done at different temperatures, and the wear properties of modified surfaces thus determined were analyzed. The results of the analysis show that the wear resistance of the specimens decreased with increase in the rate of rotation of the stirring tool, when the penetration depth and the wear test temperature were kept constant. The wear resistances of the specimens decreased with increase in the penetration depth, when the rate of rotation of the stirring tool and the wear test temperature were kept constant. The specimen hardness initially increased with an increase in the wear test temperature, and then decreased with further increase in the wear temperature, with the rate of rotation of the stirring tool and the penetration depth kept constant. The main reason is that the softening material of specimen surface was removed at 100℃, resulting in an increase in the hardness of the modified surface. At 200℃, the modified surface underwent recrystallization, resulting in grain refinement of the modified surface. With increase in the wear test temperature, there was further grain growth, resulting in lower hardness at 500℃DOI: http://dx.doi.org/10.5755/j01.ms.23.3.16322

Keywords

• friction stir surface processing, wear resistance, copper alloy, hardness, microstructure