Stacked porous NiTi structure with low cost and ultrahigh fatigue life for elastocaloric cooling.

A stamped-and-stacked porous NiTi (nitinol) honeycomb structure endures over 10 8 compression cycles and delivers 3850 watts per kilogram for elastocaloric cooling.

• Why it matters: Cost-effective fabrication of fatigue-resistant, heat-transfer-enhanced SMA structures is a major barrier to commercial elastocaloric cooling.
• What they did: The authors stamp honeycomb-like chips from NiTi thin sheets and stack them into a layered tubular porous structure to boost heat exchange while mitigating buckling and splitting.
• The result: The resulting structure survives >10 8 compression cycles and achieves high specific cooling power, while the S-S method cuts fabrication cost by one order of magnitude versus existing approaches, supporting mass production.

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