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Quarternary and Quinary Additions to Directionally-Solidified X-X3Si Eutectics of Chromium and Vanadium

Published online by Cambridge University Press:  15 March 2011

J Ang ,
VA Vorontsov ,
CL Hayward ,
G Balakrishnan ,
HJ Stone  and
CMF Rae
J Ang
Affiliation:
Dept. of Materials Science, University of Cambridge, Pembroke St., Cambridge, CB2 3QZ, U.K.
VA Vorontsov
Affiliation:
Dept. of Materials Science, University of Cambridge, Pembroke St., Cambridge, CB2 3QZ, U.K.
CL Hayward
Affiliation:
School of Geosciences, University of Edinburgh, West Mains Road, Edinburgh, EH9 3JW, U.K.
G Balakrishnan
Affiliation:
Department of Physics, University of Warwick, Coventry, CV4 7AL, U.K.
HJ Stone
Affiliation:
Dept. of Materials Science, University of Cambridge, Pembroke St., Cambridge, CB2 3QZ, U.K.
CMF Rae
Affiliation:
Dept. of Materials Science, University of Cambridge, Pembroke St., Cambridge, CB2 3QZ, U.K.
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Abstract

An alternative high temperature structural alloy system based on the X-X3Si eutectic compositions of chromium and vanadium is put forward. These low-density (~6g/cm3) eutectics have a bcc solid-solution to increase alloy fracture toughness, and a A15 X3Si as the high temperature load-bearing phase. (½Cr,½V)-(½Cr,½V)3Si was used as the base alloy for further element additions, and is represented by the symbol 山 10at.% tantalum and aluminium were substituted for vanadium as quaternary and quinary alloy additions.

Microstructure, elemental phase partitioning, compression creep and oxidation results will be discussed. Cr-Cr3Si has a tidy, fine lamellar microstructure. Vanadium coarsens and destabilises the lamellae to a limited extent. Tantalum addition causes two distinct populations of eutectic to form; one population having finer lamellae than the other. Aluminium does not coarsen or destabilise the lamellar microstructure. High temperature compression tests at 1200°C and 1300°C show that 山 is stronger than the binary alloys, and of similar strength to the quaternary and quinary alloys.

Keywords

alloyCrSi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n07-10
Copyright
Copyright © Materials Research Society 2011

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