Cover Page November-2014-Advanced Materials Letters

Advanced Materials Letters

Volume 5, Issue 11, Pages 629-633, November 2014
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Martensite Deformation And Phenomenon Of Hysteretic Shape Change In TiNi-based Alloys

Victor E. Gunther1, Timofey L. Chekalkin1*, Ji-Soon Kim2, Valentina N. Hodorenko1

1Tomsk State University, Research Institute of Medical Materials and Shape Memory Implants, Tomsk, Russia

2University of Ulsan, School of Materials Science and Engineering, Ulsan, South Korea

Adv. Mater. Lett., 2014, 5 (11), pp 629-633

DOI: 10.5185/amlett.2014.05574

Publication Date (Web): Nov 09, 2014



The brief overview of published articles on Nitinol studies reflects, in fact, a little misunderstanding of a thermodynamic importance since there is no whole concept or paradigm considering the martensite transition and related effects in terms of thermodynamic arguments. TiNi-based alloys are basically functional materials. They’re more important for what they do than for what they are. In order to make it easier to understand complicated behavior of TiNi-based alloys under general and special conditions, a new approach is introduced. This work was aimed at studying the hysteretic behavior of TiNi-based alloys. Mechanism of hysteretic phenomenon in TiNi-based alloys showing shape memory effect, superelasticity and ferroelasticity has been considered. Hysteretic behavior in repeatable shape memory effect was thermodynamically analyzed with the aid of Helmholtz potential formalism. Correlation of deformation, temperature and latent heat of phase transition under the constant load was established. Maximum hysteresis width achieves when the product ??? during phase transition tends to ?H, and when the product ??? tends to zero the value of ?T approximates the difference (As – Mf) or (Af – Ms).


Martesite deformation, martensite transition, shape memory effect, superelasticity, ferroelasticity, TiNi-based alloy

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