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Estimation of Interfacial Energies Based on the Shapes of Coherent Intragranular Precipitates

Published online by Cambridge University Press:  02 July 2020

Xiao Chen  and
L. Rabenberg
Xiao Chen
Affiliation:
Texas Materials Institute, University of Texas at Austin, Austin, TX78712
L. Rabenberg
Affiliation:
Texas Materials Institute, University of Texas at Austin, Austin, TX78712
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Extract

In a study of the precipitation and aging of Invar particles in Cu, we observed that the particles evolved from spherical to cuboidal as they grew in size. This behavior has been observed in other systems, and predicted by Voorhees et al. ; they showed that the precise shape of the particle is a balance between elastic anisotropy and surface energy. The correlation between our results and their predictions are very good. It is the purpose of this note to point out that simultaneous measurements of size, shape, and mismatch of a coherent particle can be used to estimate the interfacial energy under favorable conditions.

Ternary alloys consisting of Cu - 12.8 wt% Ni -7.2 wt% Fe were arc-melted, held at 1030°C to develop extended regions of the Cu-rich solid solution, quenched, then aged at various times and temperatures to develop FCC precipitates near the Invar composition in the FCC Cu matrix.

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 864 - 865
Copyright
Copyright © Microscopy Society of America

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References

1.Voorhees, P.W., McFadden, G.B. and Johnson, W.C., Acta metall. mater. 40, (1992) 2979.CrossRefGoogle Scholar
2. This research was supported by the Texas Advanced Technology Program, Project #003658-254.Google Scholar