铝箔吸收层厚度对激光诱导AZ31B镁合金冲击波的影响  

Effects of aluminum foil absorbing layer thickness on induced laser shock wave of AZ31B magnesium alloy

作　　者：冯爱新[1,2] 毛加成 程宝义[2] 印成[2] 曹宇鹏[2,3] 章正刚[2] 吴浩[2] 张华夏[2] 陆金花[1] 

机构地区：[1]温州大学机电工程学院,浙江温州325035 [2]江苏大学机械工程学院,江苏镇江212013 [3]南通大学机械工程学院,江苏南通226019

出　　处：《材料热处理学报》2016年第5期7-11,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51175237;51305050);"高档数控机床与基础制造装备"科技重大专项(2013ZX04009031-4);科技部中俄双边政府间2014-2015科技合作项目(CR17-11);浙江省国际科技合作专项(2013C14007);温州市工业科技研究开发项目(J20130033);江苏省"六大人才高峰"A类项目;温州大学高级人才启动基金

摘　　要：为分析不同厚度的铝箔吸收层对激光在AZ31B镁合金薄板背面诱导的高应变率冲击波的影响,采用聚偏氟乙烯(PVDF)贴片传感器与数字示波器对强激光诱导的冲击波进行测量,利用测得的不同厚度吸收层下的压电波形,计算转换得到相应的冲击波压力波形。结果表明:铝箔吸收层厚度分别为100μm、200μm、300μm时,激光冲击波压力峰值随着吸收层厚度的增加而降低,冲击波第一个脉冲的脉宽随着吸收层厚度的增加而时间增长,即维持较高压力作用的时间增长;吸收层厚度为100μm时试样表面存在烧蚀损伤现象,吸收层厚度为300μm时,吸收层未完全气化,吸收层厚度为200μm时,冲击波作用的综合优势明显,吸收层过薄或过厚对冲击效果不利。In order to analyze the effect of different thickness of aluminum foil absorbing layer on the high strain rate shock wave induced by laser on the back surface of AZ31 B magnesium alloy sheet,the shockwaves induced by high intensity laser were measured by a poly（ ethylene fluoride）（ PVDF） patch sensor and a digital oscilloscope. Then the corresponding pressure waveforms was calculated by using the measured wave of the different thickness of the absorption layer. The results indicate that when the thickness of the absorbing layer is100 μm,200 μm,300 μm respectively,the peak pressure of the shockwave decreases and the first shockwave pulse width increases with increasing of the absorbing layer thickness,which means the high pressure time keeps longer,the specimen surface has ablation damage when the absorbing layer thickness is 100 μm; and when the absorbing layer thickness is 300 μm,it is not completely gasified. The comprehensive advantage of shock wave is obvious when the absorbing layer thickness is 200 μm. Both of too thin or too thick of absorbing layers have opposite effects to shock wave.

关 键 词：激光冲击波 铝箔 吸收层 激光烧蚀 压力波形 

分 类 号：TG146.2[一般工业技术—材料科学与工程]