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

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 87...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2020-03, Vol.139 (6), p.3405-3413
Main Authors: Kök, Mediha, Al-Jaf, Ahmed Omar Ali, Çirak, Z. Deniz, Qader, Ibrahim Nazem, Özen, Ecem
Format: Article
Language:English
Subjects:
Alloying elements
Alloys
Analytical Chemistry
Calorimetry
Chemical compounds
Chemistry
Chemistry and Materials Science
Crystal structure
Crystals
Differential scanning calorimetry
Electrical resistivity
Enthalpy
Gibbs free energy
Grain size
Heat treating
Heat treatment
Inorganic Chemistry
Intermetallic compounds
Martensitic transformations
Measurement Science and Instrumentation
Nickel base alloys
Nickel titanides
Phase transitions
Physical Chemistry
Polymer Sciences
Shape memory alloys
Structure
Temperature
Titanium dioxide
Transformation temperature
Vanadium
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Summary: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., TiO 2 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.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-019-08788-3