Effect of Ag additions on the β phase formation reaction in the Cu-9 wt.%Al-6 wt.%Mn alloy

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Data

2015-09-15

Autores

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

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Resumo

The influence of 4 and 5 wt.%Ag additions on the kinetics of β [T<inf>7</inf>-(CuMn)<inf>3</inf>Al] phase formation reaction in the Cu-9 wt.%Al-6 wt.%Mn alloy was studied using differential scanning calorimetry (DSC), X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The results indicate that the conversion dependence of the activation energy has a descending shape, suggesting a multi-step process involving reversible reactions. The presence of Ag facilitates the formation of the β phase. The results also showed that the Ag precipitates formation includes the dissolution of Mn and Al atoms, thus decreasing the partial fraction of these elements available to react.

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Kinetics, Metals and alloys, Solid state reactions, Thermal analysis

Como citar

Journal of Alloys and Compounds, v. 643, n. S1, p. S275-S279, 2015.