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Effects of boron on microstructure in cast zirconium alloys

Published online by Cambridge University Press:  31 January 2011

M.S. Dargusch ,
M.J. Bermingham ,
S.D. McDonald  and
D.H. StJohn
D.H. StJohn
Affiliation:
CAST Cooperative Research Centre, Defence Materials Technology Centre, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Brisbane, Queensland 4067, Australia
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Abstract

Trace additions of boron to cast zirconium result in significant microstructural changes similar to those observed with additions of boron to titanium alloys. These changes include the promotion of dendritic growth and a refinement in both the prior β and α grain size. The refinement of the prior β grain size is explained using a model of grain refinement in association with values calculated from the binary Zr–B phase diagram. It is proposed that the refinement of the α phase occurs through a combination of increased nucleation and altered diffusion mechanisms during cooling through the β transus.

Keywords

ZrCastingGrain Size
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 9 , September 2010 , pp. 1695 - 1700
Copyright
Copyright © Materials Research Society 2010

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