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Abstract  

Thermal behavior of α-(Cu–Al–Ag) alloys, i.e. alloys with composition less than about 8.5 mass% Al, was studied using differential scanning calorimetry (DSC), differential thermal analysis (DTA), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffractometry (XRD). The results indicated that the presence of silver introduces new thermal events ascribed to the formation of a silver-rich phase and, after addition higher amounts than 8 mass% Ag to the Cu–8 mass% Al alloy it is possible to observe the formation of the γ1 phase (Al4Cu9), which is only observed in alloys containing minimum of 9 mass% Al. These results may be attributed to some Ag characteristics and its interaction with Cu and Al.

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. This effect is associated with Ag–Al interaction during Al atoms diffusion and the formation of γ 1 phase. The Cu-rich phase of the Cu–Al–Ag alloys is a fcc solid solution of Al and Ag in copper and the high temperature β phase has a bcc

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heating and that these precipitates dissolve preferentially in the (α + γ 1 ) phase [ 8 ], due to Al excess in this phase and to the Ag–Al interaction. Hence, this peak can be related with Ag precipitates dissolution in the (α + γ 1 ) phase, formed from

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