Elastocaloric effect in a textured polycrystalline Ni-Mn-In-Co metamagnetic shape memory alloy

By direct measurements, the elastocaloric effect at various temperatures in a [001]-oriented Ni45.7Mn36.6In13.3Co5.1 metamagnetic shape memory polycrystal has been investigated. A reversible temperature change of +/-3.5 K, due to the relatively low stress (100 MPa) induced martensitic transformation, was observed at room temperature. A theoretical analysis based on the Debye description has revealed that the adiabatic temperature change arising from the lattice vibration plays a dominant role in the large elastocaloric effect for Ni-Mn-In-Co alloys. (C) 2014 AIP Publishing LLC.