Abstract
In this paper, Al/Ni/TiC powders were mixed on the surface of A380 aluminum alloy, by selecting appropriate laser parameters; the cladding layer with good adhesion to the substrate was obtained. The microstructure and properties of the cladding layer under different laser parameters were analyzed. The results show that: the phase composition of the cladding layer is mainly composed of TiC, Al, Ni, C and Ti phases. The hardness of the cladding region is up to 173.3 HV, which is about 2.9 times the matrix (–59.1 HV). The corrosion voltage (–1.8 V) of the cladding layer shifted significantly from the corrosion potential (–1.18 V), the corrosion current density increased, the resistance value decreased and the diameter of the capacitor arc decreased; all these phenomena indicate that the corrosion resistance of the cladding layer is decreased.
Highlights
Aluminum alloys are widely used in aerospace, automotive and power machinery because of their low density, good plasticity, easy processing and low cost
The results show that: the phase composition of the cladding layer is mainly composed of TiC, Al, Ni, C and Ti phases
We can make some conclusions from the present investigation: 1) By XRD analysis, the phase composition of the cladding layer is mainly composed of TiC, Al, Ni, C and Ti
Summary
Aluminum alloys are widely used in aerospace, automotive and power machinery because of their low density, good plasticity, easy processing and low cost. Compound powder has many kinds, and the composite ceramic powder has the advantages of high strength, wear resistance, low coefficient of expansion, and so on It has been widely studied and applied [3]. R. Anand Kumar et al [4] mixed Al-12% (mass fraction, the same below) Si alloy powder and TiC powder, and clad them on the surface of Al-7% Si casting alloy by Nd:YAG laser with continuous wave; the microstructure of the cladding layer was observed and analyzed, and the sliding friction and wear test were carried out in the coating with less than 5% void and no other defects. The hardness of cladding layer was increased by 50 HV, analyzing that the presence of TiC and Si particles could improve the surface hardness of the matrix. Al/Ni/TiC powder was mixed in the proportion, cladding on the surface of A380 aluminum alloy, the morphology of cladding was observed under different parameters, and the hardness and corrosion resistance of the cladding layers were tested
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