铝合金激光熔覆处理等离子涂层的显微组织

来源期刊：中国有色金属学报1998年第1期

论文作者：梁工英 李成劳 苏俊义 郑启光 陶星之 王涛 辜建辉

文章页码：28 - 32

关键词：铝合金 激光表面处理 显微组织

Key words：aluminium alloy , laser surface treatment , microstructure

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。

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.