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Reza Beygi

Reza Beygi

Academic rank: Associate Professor
ORCID: https://orcid.org/0000-0002-0110-1642
Education: PhD.
ScopusId: 36337544600
Faculty: Engineering
Address: Arak University
Phone: 086-32625824

Research

Title
Synthesis of a NiTi2–AlNi–Al2O3 nanocomposite by mechanical alloying and heat treatment of Al–TiO2–NiO
Type
JournalPaper
Keywords
mechanical alloying; NiTi2−AlNi; nanocomposite; reaction mechanism
Year
2019
Journal International Journal of Minerals, Metallurgy, and Materials
DOI
Researchers Majid Zarezadeh Mehrizi ، Hossein Mostaan ، Mehdi Rafiei ، Ahmadreza Abbasian ، Reza Beygi

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.