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Enhanced working stability of elastocaloric effects in polycrystalline Ni-Fe-Ga dual phase alloy
Intermetallics ( IF 4.4 ) Pub Date : 2021-06-03 , DOI: 10.1016/j.intermet.2021.107255
Muhammad Imran , Xuexi Zhang , Mingfang Qian , Lin Geng

Stable elastocaloric effect (eCE) over multiple stress cycles is an indispensable aspect for the commercialization of elastocaloric refrigeration. Here, we addressed the enhanced functional stability in polycrystalline Ni53.2±0.4Fe19.4±0.2Ga27.4±0.6 dual-phase alloy, where interstitial γ-phase was incorporated via aging precipitation. The intergranular γ-precipitates confirmed the reversible superelastic effects at room temperature (296 K), which is greatly conducive to multiple interphase movement. As a consequence, notable adiabatic temperature change (ΔTad) 6.2 K with a large coefficient of performance (COPmat) 14.5 was achieved under maximum stress 300 MPa. A stable eCE cooling performance (ΔTad ~2.6 K) over 500 superelastic cycles with insignificant degradation was found under nominal stress 250 MPa. Consequently, the current work demonstrates that manipulating the microstructure by incorporating the interstitial secondary phase is a promising approach to enhance the mechanical and functional properties of ferromagnetic shape memory alloys (FMSMAs) for solid-state cooling technology.



中文翻译:

提高多晶 Ni-Fe-Ga 双相合金中弹性热效应的工作稳定性

在多个应力循环中稳定的弹性热效应 (eCE) 是弹性热制冷商业化不可或缺的方面。在这里,我们解决了多晶 Ni 53.2±0.4 Fe 19.4±0.2 Ga 27.4±0.6双相合金中增强的功能稳定性,其中间隙 γ 相通过时效析出相结合。晶间γ-沉淀物证实了室温(296 K)下的可逆超弹性效应,极大地有利于多相间运动。因此,显着的绝热温度变化 ( ΔT ad ) 6.2 K 具有大的性能系数 ( COP mat) 14.5 在最大应力 300 MPa 下达到。稳定的 eCE 冷却性能 ( ΔT ad ~2.6 K) 超过 500 次超弹性循环,在 250 MPa 的标称应力下发现劣化不明显。因此,目前的工作表明,通过加入间隙次生相来操纵微观结构是一种很有前途的方法,可以增强用于固态冷却技术的铁磁形状记忆合金 (FMSMA) 的机械和功能特性。

更新日期:2021-06-03
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