Comparative Analysis of Different Surface Modification Processes on AA 7075 T651

Abstract

Modern industries turn into light weight high strength materials. Aluminum alloys are having such a great property, in which, AA 7075 T651 provides good strength than other alloys. Hence, hardness of aluminum alloys are poor there by improvement of surface hardness of aluminum alloy is necessitate. Shot peening, severe surface mechanical treatment (SSMT) and laser shock peening (LSP) are the surface property enhancement processes, which are used to improve the surface hardness of AA 7075 T651. This article deals with study the effect of shot peening, Severe surface modification process and laser shock peening on AA 7075 T 651. Among these two processes, LSP reveals better improvement in surface hardness. The Vickers micro hardness test is contacted on the specimens. 15%, 18% and 29% of harness improvements are obtain than unpeened specimen in shot peened specimen, SSMT specimen and Laser shock peened specimen respectively. The deformed layer thickness is 500 µm found in the laser shock peened specimen and 300 µm in the shot peened and SSMT treated specimens.

Investigation of corrosion behavior on plastically deformed aa 7075 t651 by shot peening process

“…Assuming, a slight amount of wear occurs for the component during application, the next immediate layer are also stacked up with ultra-fine grain structures making it impossible to penetrate a peened component. From the EDX analysis, depicted in figure 11 it is clearly seen an increase in the sub-surface oxygen (interstitial element) content which is attributed to the diffusion (rapid in nature) along the twinning boundaries (mechanical) and dislocation density bands when the aluminium alloy is plastically deformed [26][27][28][29].…”

“…In the aluminium alloy due to high amount of localized shear it leads to low curvature of radius for twinning mechanical boundaries. With the increase in the ultrafine grain boundaries along the boundaries a deviation from a full ideal crystal is developed leading to a high amount of oxygen due to the presence of localized interfacial defects [22,26,30]. This would lead to pileup of twins in the interface, from a nascent stages thereby reducing the corrosion factor to the surface and not penetrate the sub-surface.…”

An investigation on the effect of stacking fault energies on surface mechanical treatment process of AA6061 alloy and ETP-copper

“…Due to the variation in the energy imparted by the peening media to the surface/sub-surfaces to the interior, there will be a gradation in the grain refinement with ultrafine grains in the surface and relatively coarse grains in the interior of the component. The extent of grain refinement depends on the energy imparted in the surface by the impacting balls [21][22][23][24][25].…”

Development of Al1070-Quasicrystal (Al65Cu23Fe12) composites using friction stir processing and its mechanical characterization

“…However, they have inherent limitations owing to their soft nature. Hence, these alloys are susceptible to the failures due to wear and fatigue [1][2][3][4][5]. Therefore, many of the researchers are interested in improving their strength with variety of strengthening techniques [6][7][8][9].…”