Abstract
Laser shock peening (LSP) is a surface treatment process for increasing the strength and reliability of metal components. Traditionally applied to composite structures of automotive and medical applications, the LSP technology also shows great potential for aircraft parts to improve the fatigue resistance of highly stressed critical aircraft turbine engine components, complex forming of wing surfaces, steam turbines, etc. The present study investigates the effect of laser peening without coating on the hardness of an aluminium alloy. The Vickers micro-hardness test is used to study the hardness of the Al alloy with different wavelengths and laser intensities. It is found that the metal hardness can be significantly increased to more than 80% by increasing the laser intensity and the number of laser shots irradiated per unit area.
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