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Study Of Nucleation And Growth Ev Al-Zn Alloys Using TEM

Published online by Cambridge University Press:  15 February 2011

G. Sundar ,
E. A. Kenik ,
J. J. Hoyt  and
S. Spooner
G. Sundar
Affiliation:
Dept.of Mechanical and Materials Engg., Washington State Univ., Pullman, WA 99164
E. A. Kenik
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
J. J. Hoyt
Affiliation:
Dept.of Mechanical and Materials Engg., Washington State Univ., Pullman, WA 99164
S. Spooner
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

Nucleation and growth studies were conducted on Al-Zn alloys at several temperatures using transmission electron Microscopy (TEM) with an in-situ furnace. The value of the critical undercooling was established by noting the lowest temperature at which precipitates were no longer observed, following a quench into the two-phase metastable region. These results were compared with the Langer-Schwartz Model of nucleation and growth in which it is predicted that the half-completion time (i.e, the time required for the supersaturation to reach half its initial value) diverges for initial supersaturations which are higher than those predicted by the classical nucleation theory.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 337
Copyright
Copyright © Materials Research Society 1994

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References

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