Elastocaloric cooling potential of NiTi

24 Solid state elastocaloric cooling, the endothermic reversible martensitic phase transformation in shape 25 memory alloys, has the potential to replace vapor compression refrigeration. NiTi, Ni2FeGa, and CoNiAl 26 shape memory alloys were experimentally investigated to measure the magnitude of temperature 27 change using thermography during uniaxial tensile experiments. Consecutive tensile cycles were also 28 performed, and they revealed a symmetric temperature profile between the two cycles. The unique, dual 29 camera technique of digital image correlation and thermography was utilized to track the transformation 30 bands and temperature gradients to gain insight about the unloading, endothermic process. Fatigue 31 implications, elevated temperature environments, and the theoretical maximum temperature based on 32 entropy change were discussed. 33 ! 2015 Published by Elsevier Ltd. on behalf of Acta Materialia Inc. 34