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Effects of heat treatment temperatures on phase transformation, thermodynamical parameters, crystal microstructure, and electrical resistivity of NiTiV shape memory alloy

  • Mediha KökEmail author
  • Ahmed Omar Ali Al-Jaf
  • Z. Deniz Çirak
  • Ibrahim Nazem Qader
  • Ecem Özen
Article
  • 23 Downloads

Abstract

Changing physical property of NiTi shape memory alloy by adding new element and heat treatment technique has become interesting in the last decades. In this study, equiatomic NiTi alloy was doped by 1 and 5 atomic percentages of vanadium element. For each case, heat treatment was accomplished for 873, 973, 1073, and 1173 K, and its effect on phase transformation temperatures was analyzed by differential scanning calorimetry. Crystal structure and chemical compound found in XRD pattern showed the different situation for each case, e.g., TiO2 appeared in heat-treated samples, whereby the intensity of peaks varied by changing the temperature of heat treatment. In NiTi–5V alloy, each enthalpy, entropy, Gibbs free energy, and elastic energy were decreased by increasing heat treatment temperature, while grain size of the alloy extended with respect to non-heat-treated sample. Electrical resistivity of the alloys was measured as a function of temperature, which was increased by increasing vanadium composition and heat treatment temperature.

Keywords

Shape memory alloy Heat treatment NiTiV Austenite and martensite phases Electrical resistivity 

Notes

Acknowledgements

This work has been supported by the Management Unit of Scientific Research Projects of Firat University (FUBAP) (Project Number: FF.18.02). It has been prepared from master thesis of Ahmed Omar Ali AL-JAF.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Physics, Faculty of ScienceFırat UniversityElazigTurkey
  2. 2.Department of Physics, College of EducationUniversity of GarmianKalarIraq
  3. 3.Vocational School of Health ServiceInonu UniversityMalatyaTurkey
  4. 4.Department of Physics, College of ScienceUniversity of RaparinSulaymaniyahIraq

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