(1.西安交通大學機械工程學院， 西安 710049;2.華中理工大學激光研究所， 武漢 430074)
摘 要: 利用5kW CO2 激光器， 對Al-Si合金表面的等離 子涂層(Ni-Cr-B-Si)進行熔覆處理。 SEM, TEM和X射線衍射分析結(jié)果表明，激光合金層中的組織以鋁鎳金屬間化合物（Al3Ni, Al3Ni2, AlNi和AlNi3)為主。在激光熔化層的表面,有富鋁的Al3Ni相存在 ； 而在激光熔 化層 的內(nèi)部，則有富鎳的AlNi3相存在。一些非晶組織出現(xiàn)在激光熔化層亞表層中，使得該區(qū)域有較高的硬度 (平均Hv952)， 是原等離子涂層的3倍和鋁合金基底的12倍。
關(guān)鍵字: 鋁合金 激光表面處理 顯微組織
（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
