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Formation of Quasicrystals In Rapidly Solidified Al Alloys

Published online by Cambridge University Press:  25 February 2011

Robert J. Schaefer  and
Leonid A Bendersky
Robert J. Schaefer
Affiliation:
Metallurgy Division, National Bureau of Standards, Gaithersburg, MD
Leonid A Bendersky
Affiliation:
The Johns Hopkins University, Baltimore, MD: Guest Worker at National Bureau of Standards, Gaithersburg, MD
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Abstract

Electron beam surface melting has been used to study Al-Mn and Al-Mn-Si alloys subjected to a wide range of solidification conditions. Several of the reported equilibrium intermetallic phases are not found even at moderate growth rates. Beyond a composition-dependent critical velocity the equilibrium phases are all replaced by the quasicrystalline icosahedral and decagonal (T) phases. The icosahedral phase is favored over the T phase by higher solidification velocities. The addition of Si to Al-Mn alloys eliminates the T phase, but does not significantly facilitate the formation of the icosahedral phase by electron beam melting because the ternary α and β phases of Al-Mn-Si are able to grow rapidly into the electron beam melts.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 58 , 1985 , 217
Copyright
Copyright © Materials Research Society 1986

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