Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 106: Issue 2
Influence of Ag additions on the activation energy for the reverse eutectoid reaction in Cu–Al alloys
Authors:
T. M. Carvalho Departamento de Físico-Química, Instituto de Química-UNESP, Caixa Postal 355, 14801-970, Araraquara, SP, Brazil

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A. T. Adorno Departamento de Físico-Química, Instituto de Química-UNESP, Caixa Postal 355, 14801-970, Araraquara, SP, Brazil

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A. G. Magdalena Departamento de Físico-Química, Instituto de Química-UNESP, Caixa Postal 355, 14801-970, Araraquara, SP, Brazil

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R. A. G. Silva Departamento de Ciências Exatas e da Terra, UNIFESP, 09972-270, Diadema, SP, Brazil

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Pages:
333–338
Online Publication Date:
15 Dec 2010
Publication Date:
01 Nov 2011
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-010-1210-1
Keywords:
Non-isothermal kinetics; Cu–Al alloys; Ag additions; Reverse eutectoid reaction
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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.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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