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Field-Assisted Sintering on Microstructural Evolution and Properties of TiAl Intermetallic Alloys

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Abstract

The addition of minor fractions of grain refiners commonly improves the mechanical properties of TiAl intermetallic alloys. In this study, Ti-36 wt.% Al powders were consolidated using a field-assisted sintering technique without adding grain refiners. Various temperatures (650–1300 °C) and pressures (14–50 MPa) were used to elucidate the structure–property relationship. An intermetallic of 99.9% relative density with a corresponding microhardness value of 327 ± 6 HV0.5 was achieved for alloys sintered at 1300 °C and 16 MPa. Alloys sintered at 1100 °C displayed a microstructure consisting of citrus Ti-rich grains, while a duplex microstructure consisting of γ-TiAl + α2-Ti3Al lamellae, and γ-TiAl phases were observed at 1300 °C.

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Acknowledgements

The authors would like to gratefully acknowledge the UNESCO-ANSTI/DAAD In-Region fellowship, South African Department of Science and Technology (DST)—National Research Foundation (NRF), and Tshwane University of Technology (TUT) for the financial support to carry out this research. The assistance received from the Institute for NanoEngineering Research (INER) in TUT for conducting this research is hereby acknowledged.

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Authors and Affiliations

  1. UTS-Boral Centre for Sustainable Building, Faculty of Engineering and Information Technology, University of Technology Sydney, Sydney, Australia

    E. Nsiah-Baafi

  2. Department of Materials Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

    A. Andrews

  3. Institute of NanoEngineering Research, Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa

    M. M. Ramakokovhu

  4. Centre for Nanoengineering and Tribocorrosion (CNT), University of Johannesburg, Johannesburg, 2028, South Africa

    P. A. Olubambi

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  1. E. Nsiah-Baafi
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  2. A. Andrews
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  4. P. A. Olubambi
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Correspondence to A. Andrews.

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Nsiah-Baafi, E., Andrews, A., Ramakokovhu, M.M. et al. Field-Assisted Sintering on Microstructural Evolution and Properties of TiAl Intermetallic Alloys. Trans Indian Inst Met 76, 2625–2633 (2023). https://doi.org/10.1007/s12666-023-02948-8

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