Abstract
In-situ TiC-Al3Ti reinforced AlMg composites were formed by laser cladding of (Al + Ti + B4C)/Y2O3 composites on AZ91D. A series of experiments, including SEM, XRD and EDS, had been carried out to investigate the effect of Y2O3 on microstructure evolution of in-situ generated TiC-Al3Ti phases, which has a positive impact on the comprehensive surface performance of the reinforced AlMg composites. The results showed that more precipitates with different morphology were formed in the composites ascribe to the addition of rare earth. The morphology of Al3Ti changes from rod shape to X shape when the content of Y2O3 increases. A large amount of Al3Ti and TiC aggregated in the composite with 2% Y2O3. Based on the experiments, the growth mechanism model of Al3Ti and TiC was proposed. The appropriate addition of Y2O3 can ameliorate the micro-hardness, wear resistance and corrosion resistance of the composites.
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