能量密度对A7N01铝合金激光清洗表面形貌的影响

能量密度对A7N01铝合金激光清洗表面形貌的影响 Effect of energy density on laser-cleaned surface morphology of A7N01 aluminum alloy 陈辉刚 CHEN Huigang 1 first-author 陈婧雯 CHEN Jingwen 2 陈辉 CHEN Hui 2 济南铁路局青岛机车车辆监造项目部 济南铁路局青岛机车车辆监造项目部 Qingdao Rolling Stock Supervision Project Department,Ji’nan Railway Bureau Qingdao Rolling Stock Supervision Project Department,Ji’nan Railway Bureau 西南交通大学材料科学与工程学院 西南交通大学材料科学与工程学院 School of Materials Science and Engineering,Southwest Jiaotong University School of Materials Science and Engineering,Southwest Jiaotong University 为了获得激光清洗后铝合金表面形貌的变化规律,利用脉冲宽度150 ps的激光清洗铝合金表面氧化膜后,分别采用光学显微镜、扫描电镜、能谱仪、粗糙度仪等观察和测试了激光清洗后的铝合金表面形貌、微观组织、成分和粗糙度等,结果发现,铝合金表面氧含量、粗糙度均有所降低,油污和氧化膜被清洗掉后形成了由潮水状组织和微小颗粒组成的规律的清洗痕迹。研究得出:当能量密度大于1.53 J/cm 2 时,铝合金表面温度较高,产生的等离子气体冲击微熔的铝合金表面,加深痕迹,同时加大了空气中的氧气和高温铝合金接触的面积和时间,产生了更加剧烈的氧化现象,从而使铝合金表面的激光清洗痕迹和二次氧化现象均随着能量密度的增加而增大。 In order to obtain the change law of surface morphology of aluminum alloy after laser cleaning,a laser with pulse width of 150 ps was used to clean the oxide film on the surface of aluminum alloy. The surface morphology,micros-tructure,composition and roughness of the laser-cleaned aluminum alloy were observed and tested by optical microscope,scanning electron microscope,energy spectrometer and roughness meter. It is found that after laser cleaning,the oxygen content and roughness of the surface of aluminum alloy decrease,and the oil and oxide film are washed off, forming regular cleaning traces,which are composed of tidal tissues and tiny particles. When the energy density is greater than 1.53 J/cm 2 ,the surface temperature of the aluminum alloy is high,and the generated plasma gas impacts the surface of the micro-melted aluminum alloy,making the trace deeper and increasing the area and time of contact between oxygen in the air and high-temperature aluminum alloy,thus resulting in a more severe oxidation phenomenon, so that the laser cleaning traces and secondary oxidation phenomenon of the aluminum alloy surface increase when the energy density increases. 激光清洗 铝合金 形貌 粗糙度 laser cleaning aluminum alloy morphology roughness TB490;TG146.21 2022-03-08 3 50