Abstract
The effect of recrystallisation heat treatment on the microstructure of copper–nickel–tin alloys Cu–9Ni–6Sn and Cu–6Ni–7Sn was studied. Cold deformed wire material was recrystallised by a short term anneal at 850°C, close to the solidus of the alloy. Non-cold deformed material was heat treated for up to 1 h at the same temperature range ( T=800–900°C). Slow cooling of the alloys resulted in faceted grain boundaries. Planar precipitates of (Cu,Ni) 3Sn were detected at the facets. The present observations are discussed based on two possible explanations: the non-equilibrium segregation of alloying elements during cooling and the grain boundary shape modifications due to the precipitate growth.
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