https://orcid.org/0000-0001-6982-3011
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ABSTRACT
This study addresses effect of shotpeening on surface characteristics of AA6061-SiCP composite. Aluminium composites with reinforcements of solitary and multiple particles are widely employed in the transportation, aerospace, and automotive sectors due to their exceptional properties, such as strength, stiffness, and wear resistance. However, the surface characteristics such as hardness, wear, and frictional properties are not improved much. To attain better surface properties, surface modification has become necessary. Therefore, shotpeening is employed with selected parameters to analyse surface topography before and after shotpeening using optical and scanning electron microscopes. Then, the average crystalline size (ACS), dislocation densities, and micro-strain are calculated with the X-ray diffraction (XRD) analysis and then correlated with the hardness of shot peened AA6061-SiCP composites in comparison with the untreated surface. The results demonstrate that increasing the shotpeening exposure durations improves surface characteristics compared to untreated AA6061-SiCP composites. At 140 s of exposure time, the micro-hardness is increased to approximately 143HV, crystallite size is refined to approximately 33.7 nm, micro-strain is enhanced by about 3.1 × 10−3, and dislocation density is increased by about 19.2 × 10−14 m−2. Severity of the shotpeening develops severe plastic deformation results in surface fracture and an increase in roughness of AA6061-SiCP composites.
Acknowledgements
The authors would like to be thankful Dr. M. Ravi Sankar, Associate Professor in the Dept. of Mech. Engg,IITTirupati for helping by Optical microscope.
Disclosure statement
No potential conflict of interest was reported by the author(s).