Shape Memory and Elastocaloric Effect in Au 7Cu 5Al 4 Shape Memory Alloy

21 Pages Posted: 1 Aug 2019

See all articles by Guobo Pang

Guobo Pang

Shanghai Jiao Tong University (SJTU) - State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University (SJTU) - Institute of Phase Transformation and Complex Microstructure

Mingjiang Jin

Shanghai Jiao Tong University (SJTU) - State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University (SJTU) - Institute of Phase Transformation and Complex Microstructure

Shungui Zuo

Shanghai University of Engineering Science - School of Materials Engineering

Xuejun Jin

Shanghai Jiao Tong University (SJTU) - Shanghai Key Laboratory of Materials Laser Processing and Modification

Date Written: 2019

Abstract

The shape memory and elastocaloric properties of Au7Cu5Al4 polycrystalline shape memory alloy were investigated. The alloy exhibits a reversible martensitic transformation from body-centered cubic (BCC) austenite to body-center tetragonal (BCT) martensite. During the load-biased thermal cycling test, the recoverable transformation strain increased with increasing stress and saturated at about 1.4% under 75 MPa. The entropy change and the relative cooling power under 95 MPa were determined to be 7.2 J·K-1·kg-1 and 74.4 J·kg-1, respectively. Our results suggest that the Au-Cu-Al shape memory alloy can serve as a candidate for actuator and elastocaloric application in harsh environments.

Keywords: Shape memory alloys, Au-Cu-Al, Elastocaloric effect, Martensitic transformation, Microstructure

Suggested Citation

Pang, Guobo and Jin, Mingjiang and Zuo, Shungui and Jin, Xuejun, Shape Memory and Elastocaloric Effect in Au 7Cu 5Al 4 Shape Memory Alloy (2019). Available at SSRN: https://ssrn.com/abstract=3428073 or http://dx.doi.org/10.2139/ssrn.3428073

Guobo Pang (Contact Author)

Shanghai Jiao Tong University (SJTU) - State Key Laboratory of Metal Matrix Composites

Shanghai 200030, Shanghai 200052
China

Shanghai Jiao Tong University (SJTU) - Institute of Phase Transformation and Complex Microstructure

China

Mingjiang Jin

Shanghai Jiao Tong University (SJTU) - State Key Laboratory of Metal Matrix Composites ( email )

Shanghai 200030, Shanghai 200052
China

Shanghai Jiao Tong University (SJTU) - Institute of Phase Transformation and Complex Microstructure ( email )

China

Shungui Zuo

Shanghai University of Engineering Science - School of Materials Engineering

333 8 Longteng Rd
Shanghai, 201612
China

Xuejun Jin

Shanghai Jiao Tong University (SJTU) - Shanghai Key Laboratory of Materials Laser Processing and Modification ( email )

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