Entropy change caused by martensitic transformations of ferromagnetic shape memory alloys

1Citations
Citations of this article
15Readers
Mendeley users who have this article in their library.

Abstract

In this paper, our most recent findings on the influence of magnetic order on the main transformational caloric and elastic properties of shape memory alloys (SMAs) are reviewed. It is argued that ferromagnetic order has a strong influence on the temperature interval of martensitic transformation (MT), the characteristics of stress-induced MT, and the shear elastic modulus of SMA. The problem of separation of the magnetic contributions to the entropy change DS and heat Q exchanged in the course of martensitic transformation (MT) of SMA is considered in general terms, and theoretical formulas enabling the solution of the problem are presented. As an example, the DS and Q values, which were experimentally determined for Ni-Mn-Ga and Ni-Fe-Ga alloys with different Curie temperatures TC and MT temperatures TM, are theoretically analyzed. It is shown that for Ni-Mn-Ga martensites with TM < TC, the ratio of elastic and magnetic contributions to the entropy change may be greater or smaller than unity, depending on the temperature difference TC – TM.

Cite

CITATION STYLE

APA

L’Vov, V. A., Cesari, E., Kosogor, A., Torrens-Serra, J., Recarte, V., & Pérez-Landazábal, J. I. (2017). Entropy change caused by martensitic transformations of ferromagnetic shape memory alloys. Metals, 7(11). https://doi.org/10.3390/met7110509

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free