Phase transition and ordering behavior of ternary Ti-Al-Mo alloys using in-situ neutron diffraction

Saurabh Kabra, Kun Yan, Svea Mayer, Thomas Schmoelzer, Mark Reid, Rian Dippenaar, Helmut Clemens, Klaus Dieter Liss*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Neutron diffraction has been used for in-situ investigations to elucidate the phase transformation behavior of two Mo-containing TiAl alloys with compositions of Ti-44Al-3Mo and Ti-44Al-7Mo (in at.%). Five different phases are present in these alloys. These include three ordered phases at room temperature, namely α2, β0 and γ and two disordered phases, a and β, which occur at higher temperatures. The sequence of the three phase transformations in each alloy has been determined. The phase transformation and disordering/ordering temperatures were determined on heating and cooling from the diffracted peak intensities. The neutron experiments are particularly sensitive to the order-disorder transitions in TiAl alloys, which are compared with the overall phase fractions obtained from previous high energy X-ray diffraction. Hysteresis and undercooling effects are observed for the various phase transformations and depend on the nature of atomic rearrangements.

Original languageEnglish
Pages (from-to)697-702
Number of pages6
JournalInternational Journal of Materials Research
Volume102
Issue number6
DOIs
StatePublished - 2011
Externally publishedYes

Keywords

  • In-situ experiment
  • Neutron and synchrotron radiation
  • Phase diagram
  • Phase transformation
  • TiAl alloys

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