激光冲击强化对纳秒激光辐照铝合金诱致污染物产生规律的影响  

Effect of Laser-Shock Processing on Generation of Contamination Induced by Nanosecond Laser Irradiation of Aluminum Alloy

作　　者：李养帅[1] 张军勇[1] 朱健强[1] 李畅 张文武[3] 秦秀 庞向阳[1] 孙明营[1] Li Yangshuai;Zhang Junyong;Zhu Jianqiang;Li Chang;Zhang Wenwu;Qin Xiu;Pang Xiangyang;Sun Mingying(Key Laboratory of High Power Laser and Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Ningbo Institute of Materials Techyiology&Engineering,Chinese Academy of Sciences,Ningbo,Zhejiayig 315201,China)

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800 [2]中国科学院大学,北京100049 [3]中国科学院宁波材料技术与工程研究所,浙江宁波315201

出　　处：《中国激光》2021年第18期86-93,共8页Chinese Journal of Lasers

基　　金：中国科学院战略性先导科技专项(XDA25020101);中国科学院青年创新促进会(2018282)。

摘　　要：为了降低铝合金因激光辐照而产生颗粒污染物的几率,研究了激光冲击强化对纳秒激光辐照5052铝合金诱致污染物产生规律的影响。首先采用不同功率密度的纳秒激光对5052铝合金试样进行冲击强化,而后采用纳秒激光对激光冲击强化后的5052铝合金试样进行辐照-洁净度测试,最后对比分析激光冲击强化前后5052铝合金试样表面硬度、形貌、粗糙度及因激光辐照诱致污染物产生规律的变化。研究结果表明:激光冲击强化在提高5052铝合金表面强度的同时,对抑制低通量激光辐照(不高于0.65 J/cm2)导致的污染物产生同样是有效的;对于粗糙度Ra为1.6的5052铝合金表面,经聚焦光斑直径为2.2 mm的高斯脉冲激光(光斑搭接率为50%,波长为532 nm,脉冲宽度为14 ns,功率密度为0.75~1.88 GW/cm2)冲击强化后,低通量激光辐照阶段,激光诱致污染物(粒径为0.3~0.5μm)数量降低25%~50%。研究结果为5052铝合金因激光辐照,尤其是低通量激光辐照而产生污染物的控制提供了一种新的方法。Objective With developing inertial confinement fusion technology,the damage of optical elements due to pollution has gradually become a critical bottleneck,limiting the efficiency of laser drivers.The pollutants on the surface of optical components of laser drivers comprise three types of particles,namely organic matter,metals,and minerals.The formation modes of particle pollutants primarily include microparticles produced on the surface of optical components irradiated by laser,environmental particles introduced during assembly,and particles produced because of the friction of components.The deposition of micron-sized and submicron-sized particles on the surface of optical components can reduce the transmittance of optical components and damage optical components because of local light intensity enhancement.Therefore,it is critical to realize the clean control of micron and submicron particles.Metal(supporting optical element)wall adsorption and particle splashing induced by laser irradiation are important sources of micron and submicron particle pollutants.Currently,the commonly used control methods include mechanical polishing,micro-arc oxidation,black anodization,hard anodizing,and surface microtexture of the metal tube wall.However,most of these methods have problems and shortcomings.Therefore,an effective method to realize the cleanliness control of metal pipe wall pollutants must be explored.Laser-shock processing (LSP)is a new surface strengthening technology with many advantages and application scenarios.However,few studies have been conducted on cleaning control.Therefore,in this study,5052aluminum alloy is taken as an example to study the effect of LSP on generating pollutants induced via nanosecond laser irradiation of aluminum alloy to provide new research methods and useful guidance for controlling and generating pollutants due to laser irradiation of aluminum alloy.Methods 5052aluminum alloy was used in this study.First,5052aluminum alloy samples were shock-strengthened using a nanosecond laser wit

关 键 词：激光技术 激光冲击强化 洁净控制 铝合金 激光辐照 颗粒污染物 

分 类 号：TN249[电子电信—物理电子学]