【摘要】 采用波长为515nm的飞秒绿激光对AZ31镁合金进行实验研究,计算镁合金激光烧蚀阈值与烧蚀速率,研究镁合金的激光加工机理,对比分析AZ31镁合金有无表面微结构对其腐蚀速率的影响。结果表明:镁合金的激光烧蚀阈值为1.46 J/cm2,在能量密度为8.36 J/cm2时烧蚀速率为0.68μm/pulse;随着能量密度的增大烧蚀速率增大,在能量密度为8.36 J/cm2,脉冲数为1000时可以加工出高质量的小孔。镁合金的腐蚀速率方面,微槽结构小于微柱结构,微柱结构小于光滑表面,拥有微结构表面的镁合金在24 h内的腐蚀速率约为光滑表面的1/3～1/2。更多还原

【Abstract】 In this paper, a femtosecond green laser with wavelength of 515 nm was used to process the AZ31 magnesium alloy. The laser ablation threshold and ablation rate of Mg alloy were calculated. The mechanism of femtosecond green laser process was determined. The effects of surface microstructures on corrosion rate of AZ31 magnesium alloy was compared and analyzed. The results show that the laser ablation threshold of AZ31 magnesium alloy is 1.46 J/cm2, the ablation rate is 0.68 μm/pulse in the laser fluence of 8.36 J/cm2, the ablation rate increases with the laser fluence increasing. The high-quality holes can be fabricated with the laser fluence of 8.36 J/cm2 and the pulse number of 1000. In terms of the corrosion rate of magnesium alloy, the groove structure is less than that of the columnar structure and less than that of the smooth surface, among which the corrosion rate on the microstructural surface is about 1/3～1/2 of that on the smooth surface in 24 hours.更多还原