Abstract
ABSTRACT Additive manufacturing of Al-Si alloy thin-walled components with/without interlayer adding La2O3 powder were obtained by cold metal transfer (CMT). Based on the optimisation of the CMT additive manufacturing process, the influences of La2O3 powder on the microstructure and properties of parts were analysed by using OM, SEM and EBSD. The results showed that by adding La2O3, the effective length and layer height of the component was increased due to the increase of the surface tension. Nucleation particles were increased by adding the La2O3, which resulted in that the α-Al and Al-Si eutectic were refined compared with that of no adding La2O3. By adding La2O3, the tensile properties of the part were improved. The refinement microstructure was the main reason for the improvement of mechanical behaviour.
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