Influence of Ag additions on the activation energy for the reverse eutectoid reaction in Cu-Al alloys

Influence of Ag additions on the activation energy for the reverse eutectoid reaction in Cu-Al alloys

Author Carvalho, T. M. Google Scholar
Adorno, A. T. Google Scholar
Magdalena, A. G. Google Scholar
Silva, R. A. G. Autor UNIFESP Google Scholar
Institution UNESP
Universidade Federal de São Paulo (UNIFESP)
Abstract The eutectoid transformation may be defined as a solid-state diffusion-controlled decomposition process of a high-temperature phase into a two-phase lamellar aggregate behind a migrating boundary on cooling below the eutectoid temperature. in substitutional solid solutions, the eutectoid reaction involves diffusion of the solute atoms either through the matrix or along the boundaries or ledges. the effect of Ag on the non-isothermal kinetics of the reverse eutectoid reaction in the Cu-9 mass%Al, Cu-10 mass%Al, and Cu-11 mass%Al alloys were studied using differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning electron microscopy (SEM). the activation energy for this reaction was obtained using the Kissinger and Ozawa methods. the results indicated that Ag additions to Cu-Al alloys interfere on the reverse eutectoid reaction, increasing the activation energy values for the Cu-9 mass%Al and Cu-10 mass%Al alloys and decreasing these values for the Cu-11 mass%Al alloy for additions up to 6 mass%Ag. the changes in the activation energy were attributed to changes in the reaction solute and in Ag solubility due to the increase in Al content.
Keywords Non-isothermal kinetics
Cu-Al alloys
Ag additions
Reverse eutectoid reaction
Language English
Date 2011-11-01
Published in Journal of Thermal Analysis and Calorimetry. Dordrecht: Springer, v. 106, n. 2, p. 333-338, 2011.
ISSN 1388-6150 (Sherpa/Romeo, impact factor)
Publisher Springer
Extent 333-338
Origin http://dx.doi.org/10.1007/s10973-010-1210-1
Access rights Closed access
Type Article
Web of Science ID WOS:000296065100004
URI http://repositorio.unifesp.br/handle/11600/34184

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