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Enhanced cyclic stability of elastocaloric effect in oligocrystalline Cu–Al–Mn microwires via cold-drawing.

Author(s) : YUAN B., QIAN M., ZHANG X., IMRAN M., GENG L.

Type of article: IJR article

Summary

The cyclic stability of the elastocaloric effect (eCE) is an important performance for elastocaloric refrigeration. Our previously work showed that Cu-Al-Mn microwires with bamboo grains exhibited favorable eCE with small hysteresis. Here, we demonstrated that oligocrystalline grain architecture in Cu-Al-Mn microwires created via multi-step cold-drawing having favorable eCE cyclic stability. The oligocrystalline grains exhibited a preferential 〈101〉 orientation along the wire axis. The annealed microwire with diameter 130 µm showed stress-induced entropy change (ΔSσ) of 5.0 J kg−1 K−1 but degraded rapidly after  ~ 15 cycles. On the other hand, the as-drawn microwire with diameter 130 µm showed a large entropy change (ΔSσ) of 10.3 J kg−1 K−1 and a temperature change (ΔT) of 4.5 K with fast fatigue rate. Moreover, the microwire exhibited a smaller ΔT = 3.0 K with stability up to 275 cycles for further cold-drawn to diameter 80 µm. The enhanced cyclic stability of elastocaloric effect in as-drawn microwire was attributed the favorable grain orientation and enhanced yield strength induced by cold-drawing. This work is instructive for designing high-performance Cu-based elastocaloric materials for solid-state cooling applications.

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Pages: 54-61

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  • Original title: Enhanced cyclic stability of elastocaloric effect in oligocrystalline Cu–Al–Mn microwires via cold-drawing.
  • Record ID : 30027445
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 114
  • Publication date: 2020/06
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.02.020
  • Document available for consultation in the library of the IIR headquarters only.

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