The martensitic transformation (MT), microstructure, mechanical properties and elastocaloric properties of Ni₄₀Fe_xCo_10-xMn₃₂Al₁₈ (x = 2, 4, 6 at.%) polycrystalline alloys were comprehensively investigated. The MT temperature of these alloys shifts to lower temperatures as Fe/Co ratio increases. The fracture strength is significantly enhanced from 905 MPa of Ni₄₀Fe₂Co₈Mn₃₂Al₁₈ to 1275 MPa of Ni₄₀Fe₆Co₄Mn₃₂Al₁₈. Among these alloys, Ni₄₀Fe₄Co₆Mn₃₂Al₁₈ exhibits the best elastocaloric properties. A large temperature change of 6.1 K was obtained by applying a uniaxial stress of 400 MPa, and the temperature change about −5.2 K maintains almost constant after 100 stress cycles in the Ni₄₀Fe₄Co₆Mn₃₂Al₁₈ alloy. The research results demonstrate an effective method to optimize elastocaloric materials used in solid-state refrigeration field.

全面研究了Ni ₄₀ Fe _x Co _10-x Mn ₃₂ Al ₁₈（x = 2，4，6 at。％）多晶合金的马氏体转变（MT），显微组织，力学性能和弹性热学性能。这些合金的MT温度随着Fe / Co比的增加而降低。断裂强度从Ni ₄₀ Fe ₂ Co ₈ Mn ₃₂ Al _18的905 MPa提高到Ni ₄₀ Fe ₆ Co ₄ Mn ₃₂ Al _18的1275 MPa 。在这些合金中，Ni ₄₀Fe ₄ Co ₆ Mn ₃₂ Al ₁₈表现出最好的弹性性能。通过施加400 MPa的单轴应力获得6.1 K的大温度变化，在Ni ₄₀ Fe ₄ Co ₆ Mn ₃₂ Al ₁₈合金中经过100次应力循环后，大约-5.2 K的温度变化几乎保持恒定。研究结果表明，一种有效的方法可以优化固态制冷领域中使用的弹性材料。