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Grain Boundary Diffusivity Measurement Through Kinetic Analysis Of Discontinuous Precipitation

Published online by Cambridge University Press:  25 February 2011

I. Manna ,
J. N. Jha ,
S. K. Pabi  and
W. Gust
I. Manna
Affiliation:
Department of Metallurgical Engineering, Indian Institute of Technology, Kharagpur, W.B. 721 302, India
J. N. Jha
Affiliation:
Department of Metallurgical Engineering, Indian Institute of Technology, Kharagpur, W.B. 721 302, India
S. K. Pabi
Affiliation:
Department of Metallurgical Engineering, Indian Institute of Technology, Kharagpur, W.B. 721 302, India
W. Gust
Affiliation:
Max-Planck-Institut fur Metallforschung, Seestrasse 92, 7000 Stuttgart 1, Federal Republic of, Germany
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Abstract

Discontinuous precipitation involves formation of a two phase aggregate from a supersaturated solid solution behind a migrating boundary. It is established that the solute transport occurs primarily through the migrating boundary, called the reaction front. This report presents a systematic study of discontinuous precipitation in a Zn-Ag alloy and measurement of grain boundary chemical diffusivity of Ag in Zn-Ag using a suitable analytical model for the first time. The necessary kinetic parameters were determined by optical and scanning electron microscopes. The activation energy for boundary chemical diffusion of Ag in Zn-Ag has been estimated to be 65.8 kJ/mol.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 517
Copyright
Copyright © Materials Research Society 1992

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References

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