Enhanced elastocaloric effect and refrigeration properties in a Si-doped Ni-Mn-In shape memory alloy

Abstract

• Large transformation entropy change and low-hysteresis are realized in a <0 0 1> A textured Ni 50 Mn 35 In 13 Si 2 alloy by composition adjusting. • Giant adiabatic temperature variation up to −17.7 K is achieved on unloading. • Large stress-induced entropy change of 25.9 J kg −1 K −1 and giant refrigeration capacity of 1330 J kg −1 are achieved under the compressive stress of 300 MPa. We demonstrate giant elastocaloric effect and outstanding refrigeration capacity in a <0 0 1> A textured Ni 50 Mn 35 In 13 Si 2 alloy with large transformation entropy change Δ S tr and low-hysteresis Δ T hys . On unloading from a relatively low compressive stress of 300 MPa, giant adiabatic temperature variation Δ T ad up to –17.7 K was realized. Moreover, large stress-induced entropy change Δ S σ of 25.9 J kg –1 K –1 and giant refrigeration capacity RC σ of 1330 J kg –1 were achieved under the compressive stress of 300 MPa. Simultaneously achieving giant Δ T ad and outstanding refrigeration capacity indicates that this alloy is promising to be the candidate material for elastocaloric refrigeration.