(1.西安交通大学机械工程学院， 西安 710049;2.华中理工大学激光研究所， 武汉 430074)
摘 要: 利用5kW CO2 激光器， 对Al-Si合金表面的等离 子涂层(Ni-Cr-B-Si)进行熔覆处理。 SEM, TEM和X射线衍射分析结果表明，激光合金层中的组织以铝镍金属间化合物（Al3Ni, Al3Ni2, AlNi和AlNi3)为主。在激光熔化层的表面,有富铝的Al3Ni相存在 ； 而在激光熔 化层 的内部，则有富镍的AlNi3相存在。一些非晶组织出现在激光熔化层亚表层中，使得该区域有较高的硬度 (平均Hv952)， 是原等离子涂层的3倍和铝合金基底的12倍。
关键字: 铝合金 激光表面处理 显微组织
（School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China;
Institute of Laser, Huazhong University of Technology, Wuhan 430074, P. R. China ）
Abstract:A plasma coating (Ni-Cr-B-Si) on the Al-Si Alloy was melted by a 5kW CO2 laser. Using SEM, TEM and X-ray diffractometer, the microstructures in the laser alloy zone were investigated. Experimental results showed that the Al-Ni intermetallic compounds ( Al3Ni, Al3Ni2, AlNi and AlNi3) were dominant in the laser alloy zone. Some Al-rich AlNi, Al+Al3 Ni eutectics exist in the surface of laser alloy zone, and some Ni-rich in the inner region of laser alloy zone. Some amorphous structures are in the sub-surface of laser alloy zone, which makes this region have higher average hardness (HV 952). This hardness is twice higher than that of the plasma coating and 11 times higher than that of the Al substrate.
Key words: aluminium alloy laser surface treatment microstructure
Key words: aluminium alloy laser surface treatment microstructure
