Abstract
In this paper, a novel droplet + arc additive manufacturing has been proposed for fabricating particle-reinforced Al matrix composites parts with high efficiency and low cost. The tilted arc was used as heat source, Al-2219 was used as matrix, and the microscale spherical WC and Ti particles were used as reinforced phases respectively. Thin-wall parts of 8.0 vol% WCP/Al and 7.5 vol% TiP/Al were successfully fabricated. The results showed that the interface pore defects were significantly affected by the wettability between particle and liquid Al matrix. Obvious pore defects were found at WC-Al interface, but no pore defects were observed at Ti-Al interface. It is also found that the complete transition from coarse columnar grains to fine equiaxed grains can be realized by particle implantation. Compared with the Al-2219 part, the average grain size of the 7.5 vol% TiP/Al part is reduced from about 100 μm to 20.7 μm.
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