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Synthesis, microstructural and phase evolution in Ti–2Ni and Ti–10Ni binary alloys consolidated by spark plasma sintering technique

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Abstract

The availability of lower-cost titanium with unique properties required for engineering applications such as in automobile, aerospace and biomedical has created a renewed interest in titanium and its alloys. However, poor sinterability due to high affinity of titanium for oxygen results in the production of less dense sintered product. While this may be of benefits in biomedical applications, it is deleterious to engineering applications such as in aviation parts that require high fatigue performance. In order to overcome this challenge, this study synthesized and consolidated Ti–2Ni and Ti–10Ni binary alloys using spark plasma sintering technique. Ti (Gd 1) and Ni elemental powders were mixed together in a TF2 Turbula mixer, at the speed of 101 rpm for 8 h. Sintering was conducted at 850, 1100 and 1200 °C under vacuum using the spark plasma sintering system. The applied pressure, heating rate and holding time were maintained at 50 MPa, 100 °C/min and 10 min respectively. Sample characterization was carried out with the aid of X-ray diffractometer and scanning electron microscope, equipped with energy-dispersive X-ray spectroscopy. The density and hardness of the sintered alloys were obtained using the Archimedes technique and Vickers microhardness tester respectively. The results showed that the relative density and hardness increased with increasing sintering temperature for the sintered Ti–2Ni and Ti–10Ni alloys. Generally, it was observed that increasing the sintering temperature and nickel addition improved the sinterability and densification of the sintered alloy.

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Funding

This work is based on the research supported by the National Research Foundation (NRF) of South Africa for the Unique Grant No. 117867.

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Authors and Affiliations

  1. Department of Chemical, Metallurgical and Materials, Faculty of Engineering and the Built Environment, Tshwane University of Technology, Pretoria, South Africa

    Azeez Lawan Rominiyi, Mxolisi Brendon Shongwe & Bukola Joseph Babalola

  2. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050, South Africa

    Nthabiseng Maledi

  3. Center for NanoEngineering and Tribocorrosion, School of Mining, Metallurgy and Chemical Engineering, University of Johannesburg, Doornfontein Campus, Johannesburg, 2028, South Africa

    Peter Apata Olubambi

Authors
  1. Azeez Lawan Rominiyi
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  2. Mxolisi Brendon Shongwe
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  3. Nthabiseng Maledi
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  4. Bukola Joseph Babalola
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  5. Peter Apata Olubambi
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Correspondence to Azeez Lawan Rominiyi.

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Rominiyi, A.L., Shongwe, M.B., Maledi, N. et al. Synthesis, microstructural and phase evolution in Ti–2Ni and Ti–10Ni binary alloys consolidated by spark plasma sintering technique. Int J Adv Manuf Technol 104, 1041–1049 (2019). https://doi.org/10.1007/s00170-019-03950-5

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  • DOI: https://doi.org/10.1007/s00170-019-03950-5

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