Study on laser surface remelting of plasma-sprayed Al-Si/1 wt% nano-Si3N4 coating on AZ31B magnesium alloy
Study on laser surface remelting of plasma-sprayed Al-Si/1 wt% nano-Si3N4 coating on AZ31B magnesium alloy
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DOI：
10.1016/j.apsusc.2013.01.204
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发表时间：
2013-05-15
影响因子：
6.7
通讯作者：
Xu, Bingshe
中科院分区：
文献类型：
--
作者：
Ge, Yaqiong;Wang, Wenxian;Xu, Bingshe
采用超音速等离子喷涂系统在AZ 31 B镁合金表面成功制备了Al-Si基微结构和1wt%Si3N4纳米结构涂层，并采用连续CO2激光器对涂层进行了重熔处理。采用光学显微镜、扫描电子显微镜、能谱仪、X射线衍射仪和维氏显微硬度计对熔覆层进行了分析。结果表明，激光熔覆层与基体具有良好的冶金结合。激光重熔后，组织中出现了细小的枝晶组织。纳米Si 3 N4在涂层中充分分解，重熔层主要由Al、AlN、Al 9 Si、Al3.21Si0.47和Mg 2Si组成。此外，重熔涂层的显微硬度提高到200- 514 HV（0.05），远高于基体的显微硬度（约50 HV 0.05）。(C)2013年爱思唯尔B。V.保留所有权利。
Plasma sprayed micro-structured Al-Si based and 1 wt% nano-structured Si3N4 coating was successfully fabricated on an AZ31B magnesium alloy using a high efficiency supersonic atmosphere plasma spraying system, and then the as-sprayed coating was remelted by a continuous wave CO2 laser. The remelted coating was investigated by optical microscope, scanning electron microscope, energy-dispersive spectroscopy, X-ray diffractometer and Vickers microhardness tester. The results indicated that the laser remelted coating possessed an excellent metallurgical bonding to the substrate. A finer dendritic structure was exhibited after laser remelting. The nano-Si3N4 decomposed fully in the coating, and the remelted coating was mainly composed of Al, AlN, Al9Si, Al3.21Si0.47 and Mg2Si. Moreover, the microhardness of remelted coating was enhanced to 200-514HV(0.05), which was much higher than that of the substrate(about 50 HV0.05). (C) 2013 Elsevier B. V. All rights reserved.