Precipitation reaction in alpha-Cu-Al-Ag alloys

Silva, Ricardo Alexandre Galdino da
Adorno, A.t.
Carvalho, T.m.
Magdalena, A.g.
Santos, C.m.a.

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Publication date

January 2011

DOI

10.1590/S1517-70762011000300002

Publisher

FapUNIFESP (SciELO)

ISSN

1517-7076

Journal

Matéria (Rio de Janeiro)

Abstract

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.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CA...