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Cao S.-Z.,National Key Laboratory of Science and Technology on Precision Heat Processing of Metals Technology | Cao S.-Z.,Harbin Institute of Technology | Xiao S.-L.,National Key Laboratory of Science and Technology on Precision Heat Processing of Metals Technology | Xiao S.-L.,Harbin Institute of Technology | And 9 more authors.
Rare Metals | Year: 2016

The cast ingots of Ti–46Al–6Nb–0.25Si–0.2B and Ti–46Al–6Nb–0.5W–0.25Si–0.2B (at%) were made by induction skull melting (ISM) technique. A series of heat treatments (HTs) were conducted to research the microstructure evolution of both alloys. Microstructure and tensile property were examined by scanning electron microscope (SEM), X-ray diffraction (XRD), transmission electron microscope (TEM), and tensile testing machine. The results show that microsegregation (liquid segregation and solid segregation) is exacerbated by the addition of 0.5 at% W; the addition of Nb, W in TiAl alloy makes the phase transition difficultly take place; then, the microstructures and tensile properties of both alloys are improved after certain HT processes; finally, the thicknesses of the γ/α2 lamellae after a certain HT process are significantly affected by the number of residual γ phases before the furnace-cooling moment. © 2015, The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg.

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