Quarternary and quinary additions to directionally-solidified X-X 3Si eutectics of chromium and vanadium

J. Ang, V. A. Vorontsov, C. L. Hayward, G. Balakrishnan, H. J. Stone, C. M.F. Rae

Research output: Contribution to conferenceProceeding

1 Citation (Scopus)

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. (1/2Cr,1/2V)-(1/2Cr,1/2V)3Si was used as the base alloy for further element additions, and is represented by the symbol Cyrillic capital letter E. 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 Cyrillic capital letter E is stronger than the binary alloys, and of similar strength to the quaternary and quinary alloys.

Original languageEnglish
Pages391-396
Number of pages6
DOIs
Publication statusPublished - 30 Sep 2011
Event2010 MRS Fall Meeting - Boston, MA, United States
Duration: 29 Nov 20103 Dec 2010

Conference

Conference2010 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period29/11/103/12/10

Keywords

  • directionally-solidified X-X3Si eutectics
  • chromium
  • vanadium
  • high temperature structural alloy system
  • microstructure
  • eutectics

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