![]() ![]() Nurveren K, Akdogan A, Huang WM (2008) Evolution of transformation characteristics with heating/cooling rate in NiTi shape memory alloys. Natalia R, Sergey B (2015) Entropy change in the B2- > B19’ martensitic transformation in TiNi alloy. Motemani Y, Nili-Ahmadabadi M, Tan MJ, Bornapour M, Rayagan Sh (2009) Effect of cooling rate on the phase transformation behavior and mechanical properties of Ni-rich NiTi shape memory alloy. ![]() Laplanche G, Birk T, Schneider S, Frenzel J, Eggeler G (2017) Effect of temperature and texture on the reorientation of martensite variants in NiTi shape memory alloys. Khalil-Allafi J, Amin-Ahmadi B (2009) The effect of chemical composition on enthalpy and entropy changes of martensitic transformations in binary NiTi shape memory alloys. In: 23rd International federation of heat treatment and surface engineering congress, Savannah, Georgia, USA, pp 481–486 Keywordsīen Fraj B, Tourki Z (2016) Influence of cooling and heating rates on the thermal properties of Ni-Ti shape memory alloy. Indeed, the enthalpy change describes the evolution of the diagram slopes as function of the cooling/heating rate which allows to limit each occurred transformation domain and defines the material mechanical behavior whether superelasticity or shape memory. The findings of this study can be useful to predict the evolution of the critical stress–temperature diagram. Based on Gibbs fundamental equation, the evolution of the Gibbs free energy change was also discussed. Accordingly, it was shown that enthalpy and entropy changes, during the phase transformation process, are strongly affected by the change of this parameter. From the obtained calorimetric results, it was found that the transformation temperatures are considerably sensitive to the cooling/heating rate variation, mainly the finish temperature of the forward martensitic transformation (M f). The thermal analysis was performed at zero stress using the Differential Scanning Calorimetry (DSC) technique. The aim of this work is to experimentally investigate the effect of the cooling/heating rate on both entropy and enthalpy changes during the phase transformation of the Ni-rich NiTi Shape Memory Alloy (SMA).
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