Giant elastocaloric temperature change and its cyclic stability in [001]-oriented Cu71Al17.5Mn11.5 single crystal

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-02-18 DOI:10.1016/j.scriptamat.2025.116603

Zeming Fan , Xiang Li , Pengna Zhang , Qijie Zhai , Gang Wang , Qiao Li , Jian Liu

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引用次数: 0

Abstract

Environmentally friendly and energy-efficient elastocaloric cooling is a promising alternative to conventional vapor-compression technology. In this work, we observed a large superelastic strain of 9.4 % and a giant adiabatic temperature change (ΔT_ad) of 19.5 K in [001]-oriented Cu₇₁Al_17.5Mn_11.5 single crystals. The present ΔT_ad breaks the record in Cu-based elastocaloric alloys. As revealed using in-situ digital imaging correlation (DIC) technique, the uniaxial stress along the [001] direction promoted two martensitic correspondent variant pairs, leading to the non-uniform strain distribution and pronounced stress hysteresis. Upon 10⁴ cycles, the ΔT_ad degraded from 19.5 to 2.1 K, with a cyclic degradation rate of 1.7 × 10⁻³ K per cycle. Our study provides valuable insights into the selection of crystallographic orientation and fatigue resistance strategy for Cu-based elastocaloric alloys.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.