Synthesis of a NiTi2-AlNi-Al2O3 nanocomposite by mechanical alloying and heat treatment of Al-TiO2-NiO

Reza Beygi; Majid Zarezadeh Mehrizi; Hossein Mostaan; Mahdi Rafiei; Ahmadreza Abbasian

doi:10.1007/s12613-019-1743-7

Volume 26 Issue 3

Mar. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(3): 345-349

Reza Beygi, Majid Zarezadeh Mehrizi, Hossein Mostaan, Mahdi Rafiei, and Ahmadreza Abbasian, Synthesis of a NiTi₂-AlNi-Al₂O₃ nanocomposite by mechanical alloying and heat treatment of Al-TiO₂-NiO, Int. J. Miner. Metall. Mater., 26(2019), No. 3, pp. 345-349. https://doi.org/10.1007/s12613-019-1743-7

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Reza Beygi, Majid Zarezadeh Mehrizi, Hossein Mostaan, Mahdi Rafiei, and Ahmadreza Abbasian, Synthesis of a NiTi2-AlNi-Al2O3 nanocomposite by mechanical alloying and heat treatment of Al-TiO2-NiO, Int. J. Miner. Metall. Mater., 26(2019), No. 3, pp. 345-349. https://doi.org/10.1007/s12613-019-1743-7

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Research Article

Synthesis of a NiTi₂-AlNi-Al₂O₃ nanocomposite by mechanical alloying and heat treatment of Al-TiO₂-NiO

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Corresponding author:
Reza Beygi E-mail: r-beygi@araku.ac.ir
Received: 19 April 2018; Revised: 3 October 2018; Accepted: 8 October 2018

Abstract

Abstract

The aim of the present study was to investigate the phases formed during ball milling of Al-TiO₂-NiO. For this purpose, a mixture of Al-TiO₂-NiO with a molar ratio of 6:1:1 was used. Characterization of the milled powders by X-ray diffraction, differential thermal analysis, field-emission scanning electron microscopy, and transmission electron microscopy showed the formation of nanocrystalline NiTi₂ along with AlNi. A thermodynamical investigation confirmed that NiO was reduced by Al during ball milling, which consequently promoted TiO₂ reduction and the formation of NiTi₂. Al is capable of reducing NiO either during ball milling or at temperatures above the melting point of Al; by contrast, TiO₂ can be reduced by Al only by milling.
- mechanical alloying;
- NiTi₂-AlNi;
- nanocomposite;
- reaction mechanism

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References

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