Large elastic strain and elastocaloric effect caused by lattice softening in an iron-palladium alloy

Tomoyuki Kakeshita; Fei Xiao; Takashi Fukuda

doi:10.1098/rsta.2015.0312

Large elastic strain and elastocaloric effect caused by lattice softening in an iron-palladium alloy

Philos Trans A Math Phys Eng Sci. 2016 Aug 13;374(2074):20150312. doi: 10.1098/rsta.2015.0312.

Authors

Tomoyuki Kakeshita¹, Fei Xiao², Takashi Fukuda²

Affiliations

¹ Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, Japan fukuda@mat.eng.osaka-u.ac.jp.
² Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, Japan.

Abstract

A Fe-31.2Pd (at.%) alloy exhibits a weak first-order martensitic transformation from a cubic structure to a tetragonal structure near 230 K. This transformation is associated with significant softening of elastic constant C'. Because of the softening, the alloy shows a large elastic strain of more than 6% in the [001] direction. In addition, the alloy has a critical point and shows a high elastocaloric effect in a wide temperature range for both the parent and the martensite phases.This article is part of the themed issue 'Taking the temperature of phase transitions in cool materials'.

Keywords: elastic deformation; martensite; phase transformation.

Publication types

Review
Research Support, Non-U.S. Gov't