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Surface alloying of a plasma sprayed aluminium coating on a copper substrate was carried out by multiple pass scanning with a focused electron beam. The degree of intermixing and the resulting solidification microstructure were dependent on the power density and repetition rate of the scanned beam. Incomplete mixing combined with rapid cooling rates can lead to considerable local departure from equilibrium, but no evidence was found of either extended solid solubility or the formation of new metastable phases. Both dendritic and eutectic type solidification structures were present in the alloyed layer. The principal phases identified were the hard intermetallic gamma, the ductile beta phase and the alpha-Cu solid solution. These phases correspond in terms of structure and composition to those existing in the Cu-rich region of the equilibrium binary phase diagram.

Additional information

Authors: RICKERBY D G, JRC Ispra (IT)
Bibliographic Reference: Paper presented: First ASM Heat Treatment and Surface Engineering Conference and Exhibition in Europe, Amsterdam (NL), May 22-24, 1991
Availability: Available from (1) as Paper EN 36168 ORA
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