Microstructural investigation of Cr-Hf-Si alloys

J. Schoonover, Y. Yang, W. J. Heward, D. Dalpe, A. Deal, M. Othon, J. R. Cournoyer, Y. A. Chang, D. Lewis, B. P. Bewlay

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Cr-Hf-Si alloys with Si concentrations up to 40 at.% were fabricated in order to study solidification microstructures in the metal-rich end of the Cr-Hf-Si ternary system. The microstructures were compared with a liquidus projection that was calculated from the extrapolated Cr-Hf-Si thermodynamic description using the CALPHAD approach. Two ternary eutectic reactions were found: L → Cr2Hf (HT) + Hf2Si + β-(Hf) at approximately Hf-33Cr-3Si and L → Cr3Si + (Cr) + Cr2Hf (HT) at approximately Hf-73Cr-9Si. The ternary phase CrHfSi was also seen. The experimental data agreed with the Hf-rich end of the calculated liquidus projection, and it was suggested how the Cr-rich end could be adjusted to account for the experimental results.

Original languageEnglish
Pages (from-to)1109-1117
Number of pages9
JournalIntermetallics
Volume16
Issue number9
DOIs
StatePublished - Sep 2008
Externally publishedYes

Keywords

  • A. Intermetallics, miscellaneous
  • A. Silicides, various
  • B. Phase diagrams
  • B. Phase identification
  • D. Microstructure

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