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The crystallization and growth of AlB2 single crystal flakes in aluminum

Published online by Cambridge University Press:  31 January 2011

C. Deppisch ,
G. Liu ,
A. Hall ,
Y. Xu ,
A. Zangvil ,
J. K. Shang  and
J. Economy
C. Deppisch
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801
G. Liu
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801
A. Hall
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801
Y. Xu
Affiliation:
Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801
A. Zangvil
Affiliation:
Department of Materials Science and Engineering, and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801
J. K. Shang
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 6180
J. Economy
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 6180
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Abstract

An in situ high temperature heat treatment was used to investigate the crystallization and growth behavior of AlB2 flakes in aluminum. Aluminum samples containing 1.8% boron were heated above the liquidus and then rapidly cooled through the Al(L) + AlB12 region to avoid the formation of AlB12 crystals. Subsequently, a homogeneous distribution of high aspect ratio AlB2 flakes crystallized upon holding below the peritectic transition temperature. Growth rate in the (a) and (c) dimensions increased during elevated hold temperatures below the peritectic transition temperature. Surprisingly, faster cooling rates from above the liquidus to room temperature resulted in thinner, wider flakes. Similar to graphite this phenomenon is believed to result from a need to accommodate a changing misfit strain energy between the solidifying aluminum and the growing AlB2 flakes.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 12 , December 1998 , pp. 3485 - 3498
Copyright
Copyright © Materials Research Society 1998

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