Applicability Of Fine Particle Peening On Surface Modification Of Aluminum Alloy

Author:  M Ando, H Kitano, H Usami and T Endo
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008072
Year of Publication:  2008
ABSTRACT The present study describes the hardening aluminum alloy modified by fine particle shot peening. The impact media were silica glass, zirconia, steel and fly-ash. Having 50 m in diameter was accelerated with pressurized gas to collide against the target surface. Surface profile, element distribution and micro hardness were measured. As a result, optimizing of the peening condition such as treatment time and gas pressure required an increase in hardness and surface roughness increased with an increase in gas pressure when silica glass and zirconia were used. It was found that the smaller fly-ash particles resulted in crush of the cohesive particles was migrated into the surface and that an increase of the hardness was larger than what was obtained with silica glass and zirconia. In the case of fine steel particle peening, a significant increase of hardness caused by transfer of the steel to aluminum surface was found. Therefore, it was concluded that transfer and migration of the impact particles was effective to increase in hardness of the aluminum surface. KEY WORDS Fine particle peening, Hardening, Penetration, Transfer, Aluminum alloy, Fly-ash

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