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Kinetics of the Icosahedral -to- Approximant Transformation in Al-Cu-Fe

Published online by Cambridge University Press:  26 February 2011

Clive Hayzelden  and
Frans Spaepen
Clive Hayzelden
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, MA 02138
Frans Spaepen
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, MA 02138
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Abstract

The kinetics of an icosahedral to approximant phase transformation were investigated in cast alloys in the composition range Al(63.65)Cu(20–25)Fe(12–15). Perfect icosahedral crystals are stable in the temperature range below the peritectic melting temperature and above approximately 700°C, below which they transform to a textured polycrystalline mixture of small microcrystals of an icosahedral approximant. The transformation is isocompositional and does not appear to occur by nucleation and growth. The kinetics of the transformation under continuous cooling and isothermal conditions were investigated using conventional and high resolution electron microscopy. The transformation is reversible, takes place over a range of compositions, temperatures and times and results in distinctive strain contrast in the electron microscope.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 205: Symposium F – Kinetics of Phase Transformations , 1990 , 183
Copyright
Copyright © Materials Research Society 1992

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