Improving wear resistance of magnesium by droplet spraying of Al-Si alloy
来源期刊：中南大学学报(英文版)2013年第7期
论文作者：XIE Kun(谢鲲) CAO Mei-qing(曹梅青) XIA Peng-cheng(夏鹏成) YUE Li-jie(岳丽杰)
文章页码：1781 - 1785
Key words：droplet spraying; Al-Si eutectic alloy; coating; magnesium; hardness; wear resistance; rapid solidification
Abstract: In order to improve the surface hardness and wear resistance of magnesium, Al-13%Si (mass fraction) alloy coating was deposited on pure magnesium by droplet spraying process. The microstructure was studied by electron probe microanalysis and X-ray diffraction. The micro-hardness and wear resistance of coating were investigated in comparison with those of the substrate. It is found that the coating layer is composed of α-Al cellular due to rapid solidification. Formation mechanism of the coating is due to the obstruction of diffusion by in-situ formed Mg2Si in interfacial layer. The coating exhibits higher hardness compared to that of the Mg substrate. As result of its high hardness, the wear resistance of the coating layer is about ten times that of the substrate. The droplet spraying process demonstrates that the magnesium surface can be strengthened by using the existing Al-Si alloys.
XIE Kun(谢鲲), CAO Mei-qing(曹梅青), XIA Peng-cheng(夏鹏成), YUE Li-jie(岳丽杰)
(School of Materials Scinence and Engineering, Shandong University of Science and Technology,
Qingdao 266590, China)
Abstract:In order to improve the surface hardness and wear resistance of magnesium, Al-13%Si (mass fraction) alloy coating was deposited on pure magnesium by droplet spraying process. The microstructure was studied by electron probe microanalysis and X-ray diffraction. The micro-hardness and wear resistance of coating were investigated in comparison with those of the substrate. It is found that the coating layer is composed of α-Al cellular due to rapid solidification. Formation mechanism of the coating is due to the obstruction of diffusion by in-situ formed Mg2Si in interfacial layer. The coating exhibits higher hardness compared to that of the Mg substrate. As result of its high hardness, the wear resistance of the coating layer is about ten times that of the substrate. The droplet spraying process demonstrates that the magnesium surface can be strengthened by using the existing Al-Si alloys.
Key words:droplet spraying; Al-Si eutectic alloy; coating; magnesium; hardness; wear resistance; rapid solidification
