激光熔覆制备铝基非晶涂层的分析-analysis of aluminum-based amorphous coating prepared by laser cladding.docxVIP

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激光熔覆制备铝基非晶涂层的分析-analysis of aluminum-based amorphous coating prepared by laser cladding.docx

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激光熔覆制备铝基非晶涂层的分析-analysis of aluminum-based amorphous coating prepared by laser cladding

AbstractThe aluminum alloy has been widely used in the fields of autotive industry， maritime transport，military and spaceflight because of its high intensity，good forming quality，low density and so on. But its low hardness，poor wearing resistance and corrosion resistance limit its wide application. Meanwhile，amorphous alloy has high hardness，good wearing resistance and corrosion resistance. Laser cladding has high heating rate and cooling rate. If the amorphous coat could be prepared by laser cladding，the hardness and corrosion resistance of aluminium alloy will be observably improved and its applied range could be expanded.In this paper，we summarize the theory and process flow of laser cladding，choosecoating composition and determine the relationship between laser process parameter and coating thickness. We got good quality alloy coating by placing Al-Ni-Y alloy powder in advance and choosing suitable laser process parameter.The microstructure，element distribution，phase and microhardness have beenanalyzed with the aid of optical microscopy ， SEM and EDS ， XRD and microhardness-tester. The result showdthat the coatings have smooth and continuous surface and metallurgical bond to the substrate. The microstructures were typicalextension growth on plane basis at the cladding layer bottom,cellular crystals near the bonding zone，dendrite crystal in the middle of the molten layer and equiaxed crystals at the top of the cladding layer. It have more Ni and Y in the central area of cladding layer.Most of them distribute in the grain boundary with mesh. The dominant phases in the cladding zone are oxide YAlO3 、Y3Al5O12 、Y2O3 、NiAl26O40 、NiAl32O49 etc and compounds Al4NiY、Al2Y3、Y5Al3 、Al3Ni2、Al4Ni3、Ni3Y、NiY etc. The cladding layer’saverage microhardness enhance from 40HV to 71.7HV. The composition of cladding layer still has some difference with the highest glass forming ability. And the result ofXRD has no proof of amorphous. They showed that it’s hard to pre