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Crystallization of A15 Nb3Ge from the amorphous state

Published online by Cambridge University Press:  31 January 2011

Marcin Wardak  and
Mireille Treuil Clapp
Marcin Wardak
Affiliation:
Department of Mechanical Engineering, University of Massachusetts, Amherst, Massachusetts 01003
Mireille Treuil Clapp
Affiliation:
Department of Mechanical Engineering, University of Massachusetts, Amherst, Massachusetts 01003
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Abstract

The critical current density Jc of superconductors is strongly dependent on microstructure. The microstructure and crystallization of amorphous Nb75Ge24.5B0.5 melt spun ribbons were studied as a function of 24-h anneals between 680 and 860 °C. Metastable A15 was formed with a composition close to that of the starting amorphous material. As the temperature increased from 680 to 720°C, crystallization remained nonuniform and the average grain size decreased from 130 nm to 60 nm. Between 740 and 800°C crystallization was uniform and the average grain size was constant at 30 nm. Above 820°C grain growth occurred. In order to have high Jc's a uniformly crystallized small-grained material is desirable.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 3 , March 1990 , pp. 478 - 483
Copyright
Copyright © Materials Research Society 1990

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References

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