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  3. Enhanced Elastocaloric Cooling Beyond Clausius-clapeyron Limits.
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  3. Enhanced Elastocaloric Cooling Beyond Clausius-clapeyron Limits.

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Enhanced elastocaloric cooling beyond Clausius-Clapeyron limits.

Yuxin Song1,2, Sheng Xu3,4, Toshihiro Omori2

  • 1Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai, Japan.

Nature Communications
|April 27, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

This study introduces a Ti-Al-Cr alloy for efficient solid-state cooling via the elastocaloric effect. It achieves a wide operating temperature range, overcoming limitations in conventional caloric materials.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Solid-State Physics

Background:

  • The elastocaloric effect, driven by stress-induced martensitic transformations, is a promising avenue for efficient, eco-friendly solid-state cooling.
  • A key challenge is the trade-off between large entropy changes and narrow operating temperature windows in existing materials.

Purpose of the Study:

  • To demonstrate an elastocaloric material overcoming the temperature span limitation for practical solid-state cooling.
  • To investigate the underlying mechanisms enabling a wide operational temperature range in a novel Ti-Al-Cr alloy.

Main Methods:

  • Direct measurement of elastocaloric cooling effect in a Ti-Al-Cr superelastic alloy.
  • Characterization of adiabatic temperature change, cooling output, and coefficient of performance.
  • Analysis of the temperature dependence of critical stress for martensitic transformation.

    • Main Results:

    • A pronounced elastocaloric cooling effect was observed over an ultra-wide temperature range (97 K to 402 K, 305 K span).
    • The material exhibited a large adiabatic temperature change (~10 K) at room temperature, with significant cooling output (5.76 J·g⁻¹) and COP (4.6).
    • The elastocaloric response remained effective across the entire temperature range, mitigating the conventional trade-off between temperature span and cooling strength.

    Conclusions:

    • The Ti-Al-Cr alloy overcomes the inherent limitations of conventional caloric materials, offering a new regime of elastocaloric behavior.
    • Anomalous temperature dependence of critical stress and high mechanical strength enable reversible transformations over a broad thermal domain.
    • Findings provide a guiding principle for designing next-generation caloric materials that surpass Clausius-Clapeyron-based limitations.