Effect of Mechanical Activation on Ti-50Ni Powder Blends Reactivity

Abstract:

In the present study, equiatomic powder blends of Ni and Ti were mechanically activated for a short period of time in a planetary ball mill using different levels of energy input. The characterization of the mechanically activated materials was achieved by scanning electron microscopy, X-ray diffraction, differential thermal analysis and chemical analysis (oxygen and nitrogen measurements). During mechanical activation no phase transformation was induced and the high temperature reaction between Ni and Ti elemental powders was shifted to lower temperatures. Moreover, the temperature and the intensity of the exothermic reaction, i.e. the reactivity observed in the powder blends, decreased with the increase in the level of milling energy input. A maximum oxygen content of 0.39 wt% was measured after mechanical activation.

• Periodical: Materials Science Forum (Volumes 636-637)
• Pages: 544-549
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.636-637.544
• Online since: January 2010
• Authors: Filipe Neves, Francisco Manuel Braz Fernandes, Jose Brito Correia
• Keywords: Mechanical Alloying (MA), Milling Energy, NiTi, Powder Metallurgy (PM), Shape Memory Alloy Actuator

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