Abstract
To improve hardness and corrosion resistance of aluminum substrate, using laser cladding technique, metal composite with Ni-based alloy, refining and dispersion strengthening Y 2O 3, particle hardening W, Cr was obtained. The microstructure and morphology, phase identification, element diffusion and composition analysis of the Ni-based alloy + Y 2O 3/substrate laser clad and laser clad/aluminum substrate interface were examined using scanning electron microscopy (SEM), Electron Probe Microanalyzer (EPMA), energy-dispersive spectrometer (EDS) analysis. The corrosion resistance was investigated also. The results showed, with the addition of Y 2O 3, more fine microstructures consisted of isometric crystal, white acicular crystal and fringe crystal; primary phases were mainly Ni 3Al, NiAl, NiAl 3, W, α-Al and Cr x C. The corrosion rate of aluminum substrate was nearly two times more than that of laser clad metals with addition of Y 2O 3.
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