Abstract

PITYANA, S.L.; CAMAGU, S.T.  and  DUTTA MAJUMDAR, J.. Laser surface alloying of Al with Cu and Mo powders. J. S. Afr. Inst. Min. Metall. [online]. 2015, vol.115, n.3, pp.193-198. ISSN 2411-9717.

Laser surface alloying was used to develop copper and molybdenum aluminides by injecting premixed copper and molybdenum powder particles into a laser-generated melt pool on an aluminium substrate. Different laser processing parameters were used to produce the composite thin layers on the substrate material. The microstructure and phase constituents of the composite layer were studied by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) techniques. Experimental results show that the matrix structure of the metal matrix composite layer consists of θ-CuAl₂ and MoAl₅. Surface hardness was increased by a factor of 3.

Keywords : laser surface alloying; metal matrix composites; intermetallic phases.

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