Eur. Phys. J. Plus (2020) 135: 58
https://doi.org/10.1140/epjp/s13360-019-00087-y

Regular Article

Exploring surface oxidation behavior of NiTi–V alloys

¹ Department of Aeronautical Engineering, Erciyes University, Kayseri, Turkey
² Department of Physics, Faculty of Science, Fırat University, Elazig, Turkey
³ Department of Physics, College of Science, University of Raparin, Sulaimaneyah, Iraq

^* e-mail: emreacar@erciyes.edu.tr

Received: 12 November 2019
Accepted: 27 December 2019
Published online: 13 January 2020

Abstract

Non-isothermal oxidation behavior of Ni₅₀Ti_49.6V_0.4 (at.%) and Ni₅₀Ti₄₆V₄ (at.%) polycrystalline alloys was investigated through thermogravimetric analysis. Differential scanning calorimetry and scanning electron microscope were used to study the role of oxidations on the transformation temperatures and surface characteristics, respectively. It was revealed that the oxidation response of the alloys is very sensitive to the vanadium content and the oxidation temperature. The oxidation constant was linearly proportional to oxidation temperatures ranging between 850 and 1150 °C. It was found that the activation energies for oxidation decreased from 207.81 5.6) to 192.8 3.8) kJ/mol, while the vanadium content increased from 0.4 to 4%. The effects of chemical composition and temperature on the oxidation behavior were discussed. The surface of both alloys was covered by a titanium dioxide and nickel-enriched layer through the isothermal oxidation process. The grain size of the alloys was affected by the increasing oxidation temperature.