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Ordering and disordering of β/βo-phase in γ-TiAl based alloys investigated by neutron diffraction

Published online by Cambridge University Press:  07 February 2017

Victoria Kononikhina*
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
Andreas Stark
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
Weimin Gan
Affiliation:
German Engineering Materials Centre at MLZ, Helmholtz-Zentrum Geesthacht, Garching, Germany
Andreas Schreyer
Affiliation:
European Spallation Source ERIC, Lund, Sweden
Florian Pyczak
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
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Abstract

TiAl based alloys are desirable materials for turbine blades in aircraft engines. Depending on alloy composition and temperature additionally disordered β-Ti(Al) (A2 structure) or ordered βo-TiAl (B2 structure) can occur. Unfortunately little is known about the exact order/disorder transformation temperatures of β/βo.

We used the good contrast of neutron diffraction for ordering and disordering of TiAl alloys to determine the order/disorder temperatures, which are not accessible by other methods like DSC measurements. Several binary TiAl alloys as well as alloys with additional alloying elements were used to investigate the influence of different Al concentrations and alloying additions on the occurring ordering/disordering reactions and phase transformations. As a result ordered βo phase was found only in selected ternary alloys.

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Articles
Copyright
Copyright © Materials Research Society 2017 

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References

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Ordering and disordering of β/βo-phase in γ-TiAl based alloys investigated by neutron diffraction
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