Influence of Laser Shock Peening without Coating on Surface, Mechanical, Corrosion, and Tribological Characteristics of AA7075/h-BN Nanocomposites
Sudheer Reddy Beyanagari, Vaira Vignesh Ramalingam, Jayakrishna Kandasamy, Katerina Skotnicova, Praveenkumar Kesavan
TL;DR
This paper studies how laser shock peening improves the surface and mechanical properties of AA7075 nanocomposites for aerospace and automotive use.
Contribution
The study introduces laser shock peening without coating as a novel method to enhance the performance of AA7075/h-BN nanocomposites.
Findings
LSPwC increased surface hardness by 7-13% due to grain refinement and compressive residual stress.
Surface roughness decreased by 12% in LSPwC-treated AA7075/h-BN composites.
Tribological performance improved, with the lowest specific wear rate and coefficient of friction observed in AA7075/1.0h-BN composites.
Abstract
AA7075 metal matrix composites have been widely used for their high strength-to-weight ratio. However, their relatively poor surface and tribological characteristics restrict their wider application in aerospace and automotive components. This study investigates the effect of laser shock peening without coating (LSPwC) on surface, mechanical, corrosion, and tribological properties of stir-squeeze cast AA7075, AA7075/0.5h-BN, and AA7075/1.0h-BN nanocomposites. LSPwC was carried out using a 1064 nm wavelength, 400 mJ laser pulse energy, 7.95 GW/cm2 power density, and 75% overlap. The LSPwC-treated specimens exhibited a significant improvement in surface hardness of ∼7% for as-cast AA7075 and ∼13% for AA7075/h-BN MMCs, primarily due to grain refinement, induced compressive residual stress (CRS), and intermetallic compound (IMC) strengthening. A reduction in surface roughness (R a) of ∼12%…
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Taxonomy
TopicsSurface Treatment and Residual Stress · Aluminum Alloys Composites Properties · Advanced machining processes and optimization