Large latent heat is produced in the stress-induced martensitic phase transition process of Ni-Mn-Ca-based
materials, i.e., elastocaloric effect. That makes such materials show tremendous potential for solid-state refrigeration
which is identified as one of the most promising non-vapor-compression cooling devices. However, the
still low refrigeration ability of these materials restricts further commercially promoting of solid-state refrigeration.
In this work, we adjusted the Co content to regulate the elastocaloric effect for the Ni_51.5Mn₂₅Ga₂₃Co_0.5.
According to the results, the transformation strain and ratio of loading stress/transformation temperature (dσ/
dT) were increased by replacing the Ni atoms with a little more Co, leading to an improvement of the stressinduced
transformation entropy-change ΔSσ. As a result, a huge ΔSσ of 45.0 JKg-1K-1 is achieved in Ni₅₀Mn₂₅-
Ga₂₃Co₁ alloy.