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Effect of the cooling rate on the thermal and thermomechanical behavior of NiTiHf high-temperature shape memory alloy

Published online by Cambridge University Press:  17 June 2020

Ogulcan Akgul ,
Halil O. Tugrul  and
Benat Kockar
Ogulcan Akgul
Affiliation:
Mechanical Engineering Department, Hacettepe University, Ankara06800, Turkey
Halil O. Tugrul
Affiliation:
Mechanical Engineering Department, Hacettepe University, Ankara06800, Turkey
Benat Kockar*
Affiliation:
Mechanical Engineering Department, Hacettepe University, Ankara06800, Turkey
*
a)Address all correspondence to this author. e-mail: benat@hacettepe.edu.tr
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Abstract

In this study, the effect of the cooling rate on the thermal and thermomechanical behavior of NiTiHf high-temperature shape memory alloy was studied by differential scanning calorimetry and via running isobaric thermal cycling experiments. The cooling rates were set to 5, 10, and 15 °C/min for each cycle in both experiments, while the heating rate was kept as 10 °C/min. It was found that the transformation temperatures and thermal hysteresis values do not depend on the change in the cooling rate. On the other hand, the austenite to martensite transformation enthalpy as measured from DSC analyses increases with the increase in the cooling rate due to the higher measurement sensitivity at higher scanning rates. Recoverable strain values which were determined from isobaric thermal cycling experiments do not differ since the transforming volume does not change with the change of the cooling rate. All these findings are explained based on the fundamental thermodynamical approach.

Keywords

alloycalorimetryphase transformation
Type
Novel Synthesis and Processing of Metals
Information
Journal of Materials Research , Volume 35 , Issue 12 , 29 June 2020 , pp. 1572 - 1581
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Copyright
Copyright © Materials Research Society 2020

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