Study on laser cladding Al+Y powder on Al-base alloy surface
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Department of Materials Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Received Date:
2007-12-06
Accepted Date:
2008-06-04
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Abstract
To prepare the high properties Al-Y coating, laser cladding was carried out with a CO2 laser by melting the preplaced Al+Y powder on the surface of 2034 Al-based alloy.SEM, XRD, EMS and micro-hardmeter were used to analyze the microstructure, components, element distribution and micro-hardness of the cladding layer.The Al-Y coating mainly consisted of Al, Y5Al3, YAl3 and YAl phases, and Y was mostly found on the grain boundary and at the interspaces of the grains.The micro-hardness measurement of the coating was in the range of 70HV0.2～95HV0.2, which was lower than 100HV0.2～120HV0.2 of the base material for decreasing the effect of solid solution strengthening of Cu element.The results show that the clad layer and the base metal are joined by the metallurgical bonding,and it has obvious finer microstructure.
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