Title
The effect of chemical composition on enthalpy and entropy changes of martensitic transformations in binary NiTi shape memory alloys The effect of chemical composition on enthalpy and entropy changes of martensitic transformations in binary NiTi shape memory alloys
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Source (journal)
Journal of alloys and compounds. - Amsterdam
Volume/pages
487(2009) , p. 363-366
ISSN
0925-8388
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
In the present research work the binary NiTi alloys with various compositions in the range of 50.351 at.% Ni were used. Samples have been annealed at 850 °C for 15 min and then quenched in water. In order to characterize transformation temperatures and enthalpy changes of the forward and the reverse martensitic transformation, Differential Scanning Calorimetric (DSC) experiments were performed. The enthalpy and entropy changes as a function of Ni atomic content have been thermodynamically investigated. Results show that enthalpy and entropy changes of martensitic transformation decrease when Ni atomic content increases. The variation of enthalpy and entropy of martensitic transformation with Ni content in binary NiTi alloys were explained by thermodynamic parameters and electron concentration of alloy (e/a) respectively.
E-info
https://repository.uantwerpen.be/docman/iruaauth/642362/798b84581d1.pdf