| Abstract: |
A new approach is explored to achieve the aluminum alloy powder layer from nanoparticle contained metallic powder mixture feedstock by Low Pressure Cold Spray (LPCS). In this approach, mixtures of micron-sized aluminum powder (average size of 25¼m) and alloying powder of Cu, Si and TiC (0.5-3 µm), at appropriate proportions to compositions of Al-5wt%Cu, Al-5wt%Cu-0.75wt%Si and Al-5wt%Cu-5wt%TiC were prepared by stirring. Then, the powder mixture was compacted into pellets, sintered and further milled to obtain the particle agglomerates (average size of 50 ¼m) . The powder feedstock were sprayed by LPCS. In this paper, we investigate the spraying behavior of the Al-based powder mixtures and analyse the mechanical properties, microstructure and nanosturcture of deposited layers using a microindentation, scanning probe microscopy, scanning electron microscopy and energy dispersive X-ray analysis.
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