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A Study of Quaternary Cr-Cr2Ta Alloys - Microstructure and Mechanical Properties

Published online by Cambridge University Press:  11 February 2013

Varun Choda ,
Ayan Bhowmik ,
Ian M. Edmonds ,
C. Neil Jones  and
Howard J. Stone
Varun Choda
Affiliation:
Department of Materials Science and Metallurgy, Pembroke Street, University of Cambridge, Cambridge CB2 3QZ, United Kingdom
Ayan Bhowmik
Affiliation:
Department of Materials Science and Metallurgy, Pembroke Street, University of Cambridge, Cambridge CB2 3QZ, United Kingdom
Ian M. Edmonds
Affiliation:
Rolls-Royce plc, P. O. Box 31, Derby DE24 8BJ, United Kingdom
C. Neil Jones
Affiliation:
Rolls-Royce plc, P. O. Box 31, Derby DE24 8BJ, United Kingdom
Howard J. Stone
Affiliation:
Department of Materials Science and Metallurgy, Pembroke Street, University of Cambridge, Cambridge CB2 3QZ, United Kingdom
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Abstract

Six alloys based on Cr-10Ta-7Si (by at.%) with quaternary additions of 0.5Ag, 5Ti, 1Hf, 3Mo, 3Al, or 3Re (by at.%) substituted for Cr were produced by vacuum arc-melting. The microstructures of the alloys were found to predominantly consist of a eutectic mixture of an A2 Cr-based solid solution and a C14 Cr2Ta Laves phase along with proeutectic Cr2Ta dendrites. Microstructural macro- and micro-scale inhomogeneities were observed in all alloy ingots, which were attributed to the non-equilibrium arc-melting process. The measured lattice parameters of the constituent phases and the elemental partitioning behaviour between the phases have been correlated with the respective covalent atomic radii. The bulk hardnesses of the alloys, along with the hardness of individual phases, have also been reported.

Keywords

Crmicrostructurehardness
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 275 - 281
Copyright
Copyright © Materials Research Society 2013 

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References

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