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Metastable Hexagonal Modifications of the NbCr2 Laves Phase as Function of Cooling Rate

Published online by Cambridge University Press:  01 February 2011

Jochen Aufrecht
Affiliation:
j.aufrecht@mf.mpg.de, Max Planck Institute for Metals Research, Stuttgart, Germany
Andreas Leineweber
Affiliation:
a.leineweber@mf.mpg.de, Max Planck Institute for Metals Research, Stuttgart, Germany
Eric Jan Mittemeijer
Affiliation:
e.j.mittemeijer@mf.mpg.de, Max Planck Institute for Metals Research, Stuttgart, Germany
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Abstract

In as-cast ingots produced by arc-melting, several metastable polytypic modifications of NbCr2 were found additional to the cubic C15 phase stable at room temperature: C14, C36 and 6H-type structures, often highly faulted and/or intergrown. Strikingly, these phases had formed at locations of the specimen which had experienced a relatively low cooling rate, whereas the C15 phase was formed preferentially in regions which had experienced the highest cooling rates.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

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References

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