Surface Properties of AA7075 Aluminium Alloy Shot Peened under Different Peening Parameters

Year 2017, Volume: 1 Issue: 1, 3 - 10, 28.12.2017

Egemen Avcu

Abstract

AA7075
aluminium alloy was shot peened with different size stainless steel shots at
different peening pressures while focusing on investigating the surface
properties of AA7075 alloy such as surface morphology, topography, and
roughness. Since shot peening (SP) is an important mechanical surface treatment
which leads to the local plastic deformation in the surface and sub-surface
regions and eventually affects surface properties, the present study aims to
clarify the effects of SP parameters on the surface properties of AA7075 T6 alloy.
A custom-design SP system was used to shot peen the alloy by stainless steel
shots with size of 0.1-0.3 mm and 0.4-0.9 mm at peening pressures of 2 bar and
4 bar. The surface properties depending on shot size and peening pressure were
investigated by a scanning electron microscope (SEM) equipped with energy
dispersive X-Ray spectroscopy (EDX) and a 3D optical profilometer. The surface
morphology affected by both parameters; larger shots and higher pressures
caused higher plastic deformation, which led to the formation of more complex
and rough surfaces in comparison to the surfaces shot peened with smaller shots
at lower pressures. 3D surface topographies were visualized the deformation,
which revealed the effects of shot size and pressure. The surface roughness
increased with increases in both particles size and pressure, which caused
highly deformed and rough surface topographies with a great number of dimples.
Embedding of fragmented shot particles occurred during peening. 

Keywords

AA7075 Alloy, Shot Peening, Shot Size, Peening Pressure

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