Observation of a metastable aluminide ThFe2Al10

T. Ganigar, A. Venkert, M. Talianker

Research output: Contribution to journalArticlepeer-review

Abstract

Metastable ThFe2Al10 ternary aluminide was observed in the as-cast Al-6.1at.%Th-6.1at.%Fe alloy. It crystallizes into an orthorhombic structure belonging to Pmmn space group symmetry and possesses unit cell with parameters a = 9.076 Å b = 8.998 Å and c = 5.031 Å. The ThFe2Al10 (Pmmn) phase can be considered as a metastable state of the equilibrium ThFe2Al10 (Cmcm) compound; its formation should be directly related to the cooling rate of the alloy during casting. After annealing the as-cast alloy at 600 °C for one week the metastable ThFe2Al10 (Pmmn) phase decomposes: the particles of this phase are no longer observed in SEM, and the diffraction peaks associated with this phase disappear in the XRD pattern.

Original languageEnglish
Pages (from-to)133-137
Number of pages5
JournalIntermetallics
Volume36
DOIs
StatePublished - 1 May 2013

Keywords

  • A. Aluminides
  • A. Intermetallics
  • B. Crystallography
  • F. Diffraction
  • F. Electron microscopy, transmission

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