研究目的

Improving the surface properties of Al7075 reinforced with SiC and Zirconia through laser peening technique.

研究成果

The results of various tests conducted on AMCs samples revealed an increasing trend in matrix properties with increased reinforcement content. Composite containing 2wt. % of SiC and 6wt. % of Zirconia fabricated showed the maximum value of the hardness, tensile strength and impact strength in comparison with other specimens which could be attributed primarily due to the presence of harder Silicon Carbide and Zirconia particles. Hardness is an important property of a component which is subjected to heavy load. The surface micro hardness of the composites was increased from 148 HV to 251 HV for 2wt% SiC and 6wt% ZrO2 after laser peening without coating. The reinforcement of particles has enhanced the micro hardness of aluminum matrix and composites. Even though LSP produce surface roughness it was minimum compared to shot peening. The surface roughness further controlled by using LSP with a coating using optimal laser parameters. SEM analysis discloses the micro phases formed during laser peening and even distribution of reinforcement in the matrix is the reason for increase surface micro hardness.

研究不足

The critical shortcomings of MMCs are their cost of manufacturing, which has placed limitations on their actual applications and distressed surface-related properties of aluminium have severely limited its further or direct use.