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Commensuration and Discommensuration in the Ag-Mg Alloys

Published online by Cambridge University Press:  25 February 2011

Y. Fujino ,
H. Sato  and
N. Otsuka
Y. Fujino
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 4V7907
H. Sato
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 4V7907
N. Otsuka
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 4V7907
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Abstract

Commensuration and discommensuration characteristics of the long period superlattice in the Ag-Mg alloys near Ag3Mg with short modulation periods (M ≃ 2) are investigated. When quenched from 650°C, the modulation periods M of these alloys is found to take theoretical values determined by the size of the Fermi surface, while upon further annealing at low temperatures, alloys assume the commensurate structure M=2, except for those alloys with theoretical M values substantially different from 2. These alloys approach the periodic discommensuration structures of the type <2j1> or its variants whose average periods M are closest to the theoretical incommensurate values. This behavior leads to the conclusion that the formation of the long period superlattice in these alloys is basically due to the CDW formation and that the commensuration and the discommensuration characteristics are determined by the free energy of the modulation boundaries.

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Articles
Information
MRS Online Proceedings Library (OPL) , Volume 62: Symposium Q – Materials Problem Solving with the Transmission Electron Microscope , 1985 , 349
Copyright
Copyright © Materials Research Society 1986

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