Improved cyclic stability of elastocaloric effect in NiTi alloys via low-angle cyclic torsion

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialia Pub Date : 2025-05-01 DOI:10.1016/j.mtla.2025.102422

Zhenquan Zhang , Ziqi Guan , Yanxu Wang , Jun Hu , Zhenzhuang Li , Jiwei Yao , Changjiang Bao , Kun Zhang , Bing Li

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引用次数: 0

Abstract

NiTi shape memory alloys, as one of the most developed and commercially produced shape memory alloys, are among the most promising candidates for elastocaloric effects refrigeration. However, attaining long-term cyclic stability remains a key challenge for practical applications. Contemporary research predominantly emphasizes adiabatic temperature change, with limited strategies addressing fatigue life. We present a novel low-angle cyclic torsion process that enhances the cyclic stability of elastocaloric effects by an order of magnitude, extending the cycle life of commercial coarse-grained NiTi shape memory alloys from 285 to 1114 cycles while maintaining a stable adiabatic temperature change of ∼-8 K. This enhancement is attributed to a gradient structure that considerably inhibits the production of dislocations during the subsequent cyclic phase transformation. This strategy offers a promising pathway to improve the cyclic stability of elastocaloric effects.

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通过低角度循环扭转提高NiTi合金弹热效应的循环稳定性

NiTi形状记忆合金作为最发达和商业化生产的形状记忆合金之一，是最有希望用于弹性热效应制冷的候选材料之一。然而，实现长期循环稳定性仍然是实际应用的关键挑战。目前的研究主要强调绝热温度变化，对疲劳寿命的研究有限。我们提出了一种新的低角度循环扭转工艺，将弹性热效应的循环稳定性提高了一个数量级，将商业粗粒NiTi形状记忆合金的循环寿命从285次延长到1114次，同时保持稳定的绝热温度变化~ -8 K。这种增强是由于梯度结构在随后的循环相变过程中显著抑制了位错的产生。该策略为提高弹性热效应的循环稳定性提供了一条有希望的途径。

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来源期刊

Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.40

自引率

2.90%

发文量

345

审稿时长

36 days

期刊介绍： Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).