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The identification and use of reversible Martensitic transformations,typically described as shape memory transformations, as a new class ofsolid-solid phase change material is experimentally demonstrated here for thefirst time. To prove this claim, time-domain thermoreflectance,frequency-domain thermoreflectance, and differential scanning calorimetrystudies were conducted on commercial NiTi alloys to quantify thermalconductivity and latent heat. Additional Joule-heating experiments demonstratesuccessful temperature leveling during transient heating and cooling in asimulated environment. Compared to standard solid-solid materials andsolid-liquid paraffin, these experimental results show that shape memory alloysprovide up to a two order of magnitude higher Figure of Merit. Beyond thesenovel experimental results, a comprehensive review of >75 binary NiTi andNiTi-based ternary and quaternary alloys in the literature shows that shapememory alloys can be tuned in a wide range of transformation temperatures (from-50 to 330{deg}C), latent heats (from 9.1 to 35.1 J/g), and thermalconductivities (from 15.6 to 28 W/mK). This can be accomplished by changing theNi and Ti balance, introducing trace elements, and/or by thermomechanicalprocessing. Combining excellent corrosion resistance, formability, highstrength and ductility, high thermal performance, and tunability, SMAsrepresent an exceptional phase change material that circumvents many of thescientific and engineering challenges hindering progress in this field.

Solid-State Thermal Energy Storage Using Reversible Martensitic Transformations