Precipitation reaction in alpha-Cu-Al-Ag alloys

AUTOR(ES)

Silva, R.A.G., Adorno, A.T., Carvalho, T.M., Magdalena, A.G., Santos, C.M.A.

FONTE

Matéria (Rio de Janeiro)

DATA DE PUBLICAÇÃO

2011

RESUMO

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.

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