The effect of Hf on the microstructure, transformation temperature, and the shape memory properties of Zr–Cu-based high-entropy shape memory alloys

Zhijie Li; Zhaolong Ma; Xingwang Cheng; Hongnian Cai

Journal of Materials Research and Technology (Mar 2024)

The effect of Hf on the microstructure, transformation temperature, and the shape memory properties of Zr–Cu-based high-entropy shape memory alloys

Zhijie Li,
Zhaolong Ma,
Xingwang Cheng,
Hongnian Cai

Affiliations

Zhijie Li: School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing 100081, China; Corresponding author. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
Zhaolong Ma: School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; Tangshan Research Institute, Beijing Institute of Technology, Tangshan 063000, China; National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing 100081, China; Corresponding author. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
Xingwang Cheng: School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; Tangshan Research Institute, Beijing Institute of Technology, Tangshan 063000, China; National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing 100081, China; Corresponding author. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
Hongnian Cai: School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing 100081, China

Journal volume & issue: Vol. 29
pp. 3585 – 3590

Abstract

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The microstructures, phase transformation temperatures, and shape memory properties of Hf-modified Zr50−xHfxCu25Ni7.5Co17.5 and Zr50−xHfxCu25Ni10Co15 high-entropy shape memory alloys (SMAs) were investigated. Hf additions can alter the valence electron concentration, strengthen the alloy matrix, and introduce more secondary phase particles, which significantly influence the properties of the alloys. The results reveal that high austenitic transformation temperature (over 600 K) with very small thermal hysteresis (70–80 K) can be achieved by tailoring the Hf contents, and the best shape memory recovery strain (up to 2.44%) compared with other Zr–Cu-based SMAs could be obtained in Zr42Hf8Cu25Ni10Co15 alloy. This study demonstrated that high-performance Zr–Cu-based high-entropy SMAs can be realized by incorporating Hf additions.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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