Elastocaloric effect and superelastic stability in Ni-Mn-In-Co polycrystalline Heusler alloys: hysteresis and strain-rate effects

Scientific Reports
Binfeng Lu, Jian Liu

Abstract

Controlling material hysteresis and working frequency variability are fundamentally important for refrigeration cycle efficiency and power density in solid-state cooling systems. For elastocaloric cooling, understanding the relationship between the width of the stress hysteresis and elastocaloric behaviour during superelastic cycles under varied strain rates is important. In this work, we report the effects of strain rate effects on the superelastic and elastocaloric responses in Ni45Mn50-xInxCo5 (x = 13.6-14.0 in at%) polycrystalline alloys. We observed a strong correlation between stress hysteresis and superelastic stability during mechanical cycling under increasing strain rates. Excellent transformation reversibility and stable superelastic responses are observed for x = 13.6 with a narrow hysteresis (49 MPa), whereas transformation irreversibility and dramatically deteriorated superelastic stability occur for x = 13.8, with a wide hysteresis (138 MPa). Furthermore, isothermal loading-unloading cycles under increasing and constant maximum applied stress were performed for the x = 13.6 samples, with a combination of low transformation stress and small transformation hysteresis. We suggest that a balance between transformatio...Continue Reading

References

Jun 4, 2008·Physical Review Letters·Erell BonnotAntoni Planes
May 29, 2012·Nature Materials·Jian LiuOliver Gutfleisch
Aug 2, 2013·The Review of Scientific Instruments·G PorcariM Solzi
Apr 23, 2014·Nature Materials·X MoyaN D Mathur
May 30, 2015·Science·Christoph ChlubaManfred Wuttig

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Citations

Nov 6, 2018·Micromachines·José FernandesPaulo Mateus Mendes

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Methods Mentioned

BETA
SMA
SMAs
X-ray

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