Precipitates Morphology in Iron-Diluted U–Fe Alloys

M. Aizenshtein, D. Hamawi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The morphology of U6Fe precipitates were investigated in the different allotropic states of uranium matrix. The morphology of γ-U is equiaxed and the characteristic size is ~65 μm. The excess dissolved iron in β-U precipitates discontinuously through a eutectoid reaction during cooling at the grain boundaries, while α-phase precipitates have a “needle-like” morphology (in many cases, aspect ratio ≫10) with a well-defined direction in the uranium matrix. This morphology may compensate for the large density differences of ~9 % between α-U and U6Fe (~19 and ~17.4 g/cm3, respectively) and the fact that precipitation takes place at relatively low temperatures. It was shown that U6Fe precipitates do not introduce new nucleation sites in β and α phases of uranium.

Original languageEnglish
Pages (from-to)363-367
Number of pages5
JournalMetallography, Microstructure, and Analysis
Volume3
Issue number5
DOIs
StatePublished - 24 Oct 2014
Externally publishedYes

Keywords

  • Microstructure
  • Needle-like morphology
  • Precipitates
  • UFe
  • Uranium–iron alloys

ASJC Scopus subject areas

  • Metals and Alloys

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