Carvalho, T. M. [UNESP]Adorno, A. T. [UNESP]Silva, R. A. G. [UNESP]2014-05-202014-05-202008-08-01Journal of Physics and Chemistry of Solids. Oxford: Pergamon-Elsevier B.V. Ltd, v. 69, n. 8, p. 2025-2031, 2008.0022-3697http://hdl.handle.net/11449/25580Ag-rich phase formation in the Cu-6 wt% Al alloy with additions of 4, 6, 8, 10, and 12 wt% Ag was studied using microhardness changes with temperature and time, differential thermal analysis (DTA), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), and X-ray diffractometry (XRD). The results indicated that the Ag-rich phase formation follows two different processes depending on Ag concentration. For alloys with 4 and 6 wt% Ag the precipitate formation occurs as a second-order mechanism while for alloys with 8, 10 and 12 wt% Ag a zero-order reaction was observed. (C) 2008 Elsevier Ltd. All rights reserved.2025-2031engalloysdiffusionArtigo10.1016/j.jpcs.2008.02.016WOS:000258977500024Acesso restrito