Elastocaloric effect in CuAlZn and CuAlMn shape memory alloys under compression

Suxin Qian; Yunlong Geng; Yi Wang; Thomas E Pillsbury; Yoshiharu Hada; Yuki Yamaguchi; Kenjiro Fujimoto; Yunho Hwang; Reinhard Radermacher; Jun Cui; Yoji Yuki; Koutaro Toyotake; Ichiro Takeuchi

doi:10.1098/rsta.2015.0309

Elastocaloric effect in CuAlZn and CuAlMn shape memory alloys under compression

Philos Trans A Math Phys Eng Sci. 2016 Aug 13;374(2074):20150309. doi: 10.1098/rsta.2015.0309.

Authors

Suxin Qian¹, Yunlong Geng², Yi Wang², Thomas E Pillsbury³, Yoshiharu Hada⁴, Yuki Yamaguchi⁴, Kenjiro Fujimoto⁴, Yunho Hwang⁵, Reinhard Radermacher⁵, Jun Cui⁶, Yoji Yuki⁷, Koutaro Toyotake⁸, Ichiro Takeuchi⁹

Affiliations

¹ Department of Refrigeration and Cryogenic Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, People's Republic of China.
² Department of Materials Science and Engineering, University of Maryland, College Park, MD, USA.
³ Department of Aerospace Engineering, University of Maryland, College Park, MD, USA.
⁴ Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan.
⁵ Center for Environmental Energy Engineering, Department of Mechanical Engineering, University of Maryland, College Park, MD, USA.
⁶ Department of Materials Science and Engineering, Iowa State University, Ames, IA, USA.
⁷ Japan Copper Development Association, Tokyo, Japan.
⁸ Shinko Metal Products Co. Ltd, Fukuoka, Japan.
⁹ Department of Materials Science and Engineering, University of Maryland, College Park, MD, USA takeuchi@umd.edu.

Abstract

This paper reports the elastocaloric effect of two Cu-based shape memory alloys: Cu68Al16Zn16 (CuAlZn) and Cu73Al15Mn12 (CuAlMn), under compression at ambient temperature. The compression tests were conducted at two different rates to approach isothermal and adiabatic conditions. Upon unloading at a strain rate of 0.1 s(-1) (adiabatic condition) from 4% strain, the highest adiabatic temperature changes (ΔTad) of 4.0 K for CuAlZn and 3.9 K for CuAlMn were obtained. The maximum stress and hysteresis at each strain were compared. The stress at the maximum recoverable strain of 4.0% for CuAlMn was 120 MPa, which is 70% smaller than that of CuAlZn. A smaller hysteresis for the CuAlMn alloy was also obtained, about 70% less compared with the CuAlZn alloy. The latent heat, determined by differential scanning calorimetry, was 4.3 J g(-1) for the CuAlZn alloy and 5.0 J g(-1) for the CuAlMn alloy. Potential coefficients of performance (COPmat) for these two alloys were calculated based on their physical properties of measured latent heat and hysteresis, and a COPmat of approximately 13.3 for CuAlMn was obtained.This article is part of the themed issue 'Taking the temperature of phase transitions in cool materials'.

Keywords: CuAlMn; CuAlZn; elastocaloric effect; refrigeration; shape memory alloy.

Publication types

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