Study on shock wave resulted from laser pulse shocking on surface LY12CZ

When a laser beam irradiates to the surface on a metal,the instantaneous energy accumulation makes a great number of metal atoms vapourous and form a shock wave propagating to the inner of materials.These reactions makes the microstructure and the propreties of the materials improved.In order to experimentally research the shock wave,the system composed of a quartz pressure transducer and a EMG201MSC excimer laser operating at 1060nm,pulse width 28ns,power density 1.06×108W/cm2,is designed to measure the laser shock wave on the surface of LY12CZ aluminum alloy,using instantaneous storage method and rolling method with a 2440 instantaneous storage oscilloscope.The experimental results show that the pressure of laser shock wave is MPa order.Finally,the attenuating equation of laser shock wave has the expression of P =13.4t-0.099,here the unit of P and t is MPa and ns respectively.