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The solidification of aluminum-manganese powders

Published online by Cambridge University Press:  31 January 2011

B. A. Mueller ,
R. J. Schaefer  and
J. H. Perepezko
B. A. Mueller
Affiliation:
Engineered Materials Development, Battelle Columbus Division, Columbus, Ohio 43201
R. J. Schaefer
Affiliation:
Metallurgy Division, National Bureau of Standards, Gaithersburg, Maryland 20899
J. H. Perepezko
Affiliation:
Department of Metallurgical and Mineral Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706
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Abstract

The solidification behavior of Al–Mn alloy powders was studied as a function of cooling rate and manganese content. The phases present in the powders differed from those expecied at equilibrium due to competetive nucleation and growth kinetics. The equilibrium Al6Mn phase was absent due to its relatively sluggish nucleation kinetics, and in the more concentrated and rapidly cooled alloy powders, the metastable quasicrystalline phases were present. Nucleation temperatures measured in alloys cooled at 25°C/s are interpreted to represent formation of the icosahedral phase, which subsequently transforms to the decagonal phase and provides a lower bound estimate of 870°C for the melting point of the icosahedral phase in an Al-30 wt. % Mn alloy.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 6 , December 1987 , pp. 809 - 817
Copyright
Copyright © Materials Research Society 1987

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References

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