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Solid Solution Decomposition of Aluminum-Rich Aluminum-Zinc-Silver Alloys

Published online by Cambridge University Press:  06 March 2019

S. R. Bates  and
R. W. Gould
S. R. Bates
Affiliation:
University of Florida Gainesville, Florida 32601
R. W. Gould
Affiliation:
University of Florida Gainesville, Florida 32601
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Abstract

Solid solution decomposition of several aluminumrich aluminum-zinc-silver alloys were investigated using x-ray small angle scattering, x-ray diffraction (Guinier and Dewolff camera) and transmission electron microscopy. A decomposition sequence was observed directly fay means of hot stage electron microscopy, to be:

G. P. zone → ɛ' → ɛ

G.P. zones were observed to exist in all of the ternary Al-Zn-Ag alloys used in this investigation. Only one type of G.P. zone was detected and evidence is given which indicated that the G.P. zone formation was governed by the existence of a metastable miscibility gap. Experimental results also indicated that the lattice of the matrix is distorted by the presence of the G.P. zone.

A transition phase, designated ɛ', was observed to nucleate on defects in the matrix and to have a hexagonal close-packed structure. The ɛ' phase is partially coherent and much more regular in spatial distribution than the equilibrium ɛ phase.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 14: Nineteenth Annual Conference on Applications of X-ray Analysis, August 5-7, 1970 , 1970 , pp. 146 - 162
Copyright
Copyright © International Centre for Diffraction Data 1970

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