Resumo

SILVA, R.A.G. et al. Precipitation reaction in alpha-Cu-Al-Ag alloys. Matéria (Rio J.) [online]. 2011, vol.16, n.3, pp. 747-753. ISSN 1517-7076.  http://dx.doi.org/10.1590/S1517-70762011000300002.

The Ag-rich precipitates formation reaction in the Cu-9.22%at. Al-4.66%at. Ag, Cu-9.31%at. Al-5.83%at. Ag and Cu-9.37%at. Al-7.08%at. Ag alloys was studied using microhardness change measurements with temperature and time, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The results indicated that the Ag-rich phase formation is an interface controlled process with a zero-order mechanism, due to the amount of unsolved Ag that makes the precipitation reaction rate independent of Ag concentration.

Palavras-chave : Ag additions; Cu-based alloys; kinetics.