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Journal of Metallurgy
Volume 2012 (2012), Article ID 153841, 6 pages
http://dx.doi.org/10.1155/2012/153841
Research Article

Fabrication of Single-Phase NiTi by Combustion Synthesis of Mechanically Activated Powders

1Centre of Excellence for Advanced Materials & Processing (CEAMP), Department of Metallurgy and Materials Engineering, Iran University of Science & Technology, Tehran 16846-13114, Iran
2Department of Materials Science & Engineering, Sharif University of Technology, Tehran 11365-11155, Iran
3Department of Materials Science and Engineering, Ferdowsi University of Mashhad, Mashhad 91779-48974, Iran

Received 25 November 2012; Accepted 13 December 2012

Academic Editor: Stefano Gialanella

Copyright © 2012 S. Mousavi Nasab et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Single-phase NiTi was fabricated through the thermal explosion mode of combustion synthesis of mechanically activated powders. Combustion and ignition temperatures of combustion synthesis were investigated in different milling times. In this process, equiatomic powder mixtures of nickel and titanium were activated by planetary ball mill and pressed into disk-shaped pellets then heated in a tube furnace, while temperature-time profile was recorded. X-ray diffraction analysis (XRD) was performed on milled powders as well as synthesized samples. Scanning electron microscopy (SEM) was also used to study the microstructural evolution during milling. The results showed that there was a threshold milling time to obtain single-phase NiTi. It was also seen that the ignition temperature and combustion temperature were reduced significantly by increasing milling time.