In this work, we demonstrate a giant elastocaloric effect in a Ni₅₀Mn₃₃In₁₄Si₁Cu₂ alloy. Owing to the large transformation entropy change and low thermal hysteresis, giant adiabatic temperature change (ΔT_ad) of − 18.2 K is obtained on unloading from a maximum compressive strain of 6 % with a low stress of 145 MPa. Moreover, large specific adiabatic temperature variation (ΔT_ad/σ_max) up to 126 K/GPa has been achieved. This ΔT_ad/σ_max value significantly exceeds those in the typical shape memory alloys. The present results demonstrate that the target alloy exhibits a distinct advantage in the strength of elastocaloric effect, being crucial for practical applications of solid-state refrigeration. In addition, it is found that the cyclic stability can be effectively enhanced by one-step overstress superelastic training for the first cycle.

在这项工作中，我们展示了 Ni ₅₀ Mn ₃₃ In ₁₄ Si ₁ Cu ₂合金中的巨大弹热效应。由于大的相变熵变化和低热滞后，在 6% 的最大压缩应变和 145 MPa 的低应力下卸载时获得了 - 18.2 K 的巨大绝热温度变化 ( ΔT _{ad )。}此外，已实现高达 126 K/GPa 的大比绝热温度变化 (Δ T _ad / σ _{max )。}这个ΔT _ad / σ _max值显着超过典型形状记忆合金中的值。目前的结果表明，目标合金在弹热效应强度方面表现出明显的优势，对于固态制冷的实际应用至关重要。此外，发现通过对第一个循环进行一步过应力超弹性训练可以有效地提高循环稳定性。