Abstract
We investigate elastocaloric effect by a combination of infrared thermography and digital image correlation technique for the metamagnetic shape memory alloy Ni45Mn44Sn11. A polycrystalline alloy containing a 〈111〉 orientated grain and an off-〈111〉 orientated grain was grown by directional solidification method. A large adiabatic temperature change of −9.5 K is observed upon stress releasing. The differently oriented grains demonstrate drastically different elastocaloric cooling behaviors, which can be ascribed to the crystalline orientation dependence of transformation strain. Moreover, large entropy changes of 10.9 and 25.8 J kg−1 K−1 for magnetic field changes of 20 and 50 kOe are obtained, respectively.
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