Effect of coherency stresses on α + α2 phase equilibria in TiAl alloys

Joo Youl Huh, J. M. Howe, W. C. Johnson

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Experiments were performed on two TiAl alloys to examine recent theoretical predictions concerning the characteristics of coherent two-phase equilibria in binary alloys. Equilibrium phase compositions in both the coherent and incoherent α + α2 states at 725 and 800°C were determined by analytical electron microscopy. The results provide experimental evidence for the following predictions: (1) tie-line ends (equilibrium phase compositions) need not coincide with phase boundaries in the temperature-composition phase diagram and (2) the tie-line ends change with alloy composition at constant temperature. The experimental results have been compared with theoretical calculations of α + α2 phase equilibria incorporating both elastic and ordering effects.

Original languageEnglish
Pages (from-to)2577-2588
Number of pages12
JournalActa Metallurgica Et Materialia
Volume41
Issue number9
Publication statusPublished - 1993 Sep 1
Externally publishedYes

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Phase composition
Phase equilibria
Binary alloys
Phase boundaries
Chemical analysis
Electron microscopy
Phase diagrams
Temperature
Experiments

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Effect of coherency stresses on α + α2 phase equilibria in TiAl alloys. / Huh, Joo Youl; Howe, J. M.; Johnson, W. C.

In: Acta Metallurgica Et Materialia, Vol. 41, No. 9, 01.09.1993, p. 2577-2588.

Research output: Contribution to journalArticle

Huh, Joo Youl ; Howe, J. M. ; Johnson, W. C. / Effect of coherency stresses on α + α2 phase equilibria in TiAl alloys. In: Acta Metallurgica Et Materialia. 1993 ; Vol. 41, No. 9. pp. 2577-2588.
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