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

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2019-03, Vol.26 (3), p.345-349
• Main Authors: Beygi, Reza, Mehrizi, Majid Zarezadeh, Mostaan, Hossein, Rafiei, Mahdi, Abbasian, Ahmadreza
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Ball milling; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Chromium steel; Composites; Corrosion and Coatings; Differential thermal analysis; Electron microscopy; Emission analysis; Engineering; Glass; Heat treating; Heat treatment; Intermetallic compounds; Investigations; Materials Science; Mechanical alloying; Melting point; Melting points; Metallic Materials; Metallurgy; Nanocomposites; Natural Materials; Nickel oxides; Particle size; Scanning electron microscopy; Surfaces and Interfaces; Temperature; Thermal analysis; Thin Films; Titanium dioxide; Transmission electron microscopy; Tribology; X-ray diffraction
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-019-1743-7

The aim of the present study was to investigate the phases formed during ball milling of Al-TiO 2 -NiO. For this purpose, a mixture of Al-TiO 2 -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 NiTi 2 along with AlNi. A thermodynamical investigation confirmed that NiO was reduced by Al during ball milling, which consequently promoted TiO 2 reduction and the formation of NiTi 2 . Al is capable of reducing NiO either during ball milling or at temperatures above the melting point of Al; by contrast, TiO 2 can be reduced by Al only by milling.