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 language | English |
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Pages (from-to) | 697-702 |
Number of pages | 6 |
Journal | International Journal of Materials Research |
Volume | 102 |
Issue number | 6 |
DOIs | |
State | Published - 2011 |
Externally published | Yes |
Keywords
- In-situ experiment
- Neutron and synchrotron radiation
- Phase diagram
- Phase transformation
- TiAl alloys