利用高功率钕玻璃激光器对7050铝合金表面进行了冲击处理,保持泵浦功率不变.用压电传感器和示波器测试了激光冲击产生的压力波形,用X射线应力测量仪测量了激光冲击后铝合金表面的残余应力,并用非接触式光学轮廓仪分析了激光冲击后铝合金的表面形貌,研究了放大自发辐射强度对激光冲击处理7050铝合金冲击压力、残余应力和粗糙度影响的微观机理.研究结果表明:在泵浦功率不变前提下,放大自发辐射强度的增大降低了激光冲击波压力,铝合金表面残余压应力也随之降低,同时铝合金表面粗糙度增大.%The 7050 aluminum alloy was processed by laser shock processing(LSP) with high energy repetition rate Nd:glass laser. With unchanged pump power, pressure waveform was measured by polyvinylidene fluoride(PVDF) and the oscilloscope, the surface residual stress of 7050 aluminum alloy was measured by X-ray diffraction, surface roughness was analysed by non-contact optical profiler, the micro-mechanism of the shock pressure, the residual stress and roughness was studied after LSP.Results show that under the condition of unchanged pump power, with the increase of amplified spontaneous emission, the shock pressure and the compressive residual stress of the sample surface gradually decrease, the surface roughness gradually increase.
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