The cyclic stability of the elastocaloric effect (eCE) is an important performance for elastocaloric refrigeration. Our previously work showed that Cu-Al-Mn microwires with bamboo grains exhibited favorable eCE with small hysteresis. Here, we demonstrated that oligocrystalline grain architecture in Cu-Al-Mn microwires created via multi-step cold-drawing having favorable eCE cyclic stability. The oligocrystalline grains exhibited a preferential <101> orientation along the wire axis. The annealed microwire with diameter 130 μm showed stress-induced entropy change (ΔS_σ) of 5.0 J∙kg⁻¹∙K⁻¹ but degraded rapidly after ∼ 15 cycles. On the other hand, the as-drawn microwire with diameter 130 μm showed a large entropy change (ΔS_σ) of 10.3 J∙kg⁻¹∙K⁻¹ and a temperature change (ΔT) of 4.5 K with fast fatigue rate. Moreover, the microwire exhibited a smaller ΔT = 3.0 K with stability up to 275 cycles for further cold-drawn to diameter 80 μm. The enhanced cyclic stability of elastocaloric effect in as-drawn microwire was attributed the favorable grain orientation and enhanced yield strength induced by cold-drawing. This work is instructive for designing high-performance Cu-based elastocaloric materials for solid-state cooling applications.

弹性热效应（eCE）的循环稳定性是弹性热制冷的重要性能。我们以前的工作表明，具有竹粒的Cu-Al-Mn微丝表现出良好的eCE，并且具有较小的磁滞现象。在这里，我们证明了通过多步冷拔在Cu-Al-Mn微丝中形成的低晶粒晶粒结构具有良好的eCE循环稳定性。所述低晶粒沿线轴表现出优先的<101>取向。将退火的微丝与直径130微米表明应激诱导熵变（ΔS _σ）的5.0Ĵ∙千克^-1 ∙ķ ^-1但迅速降解后〜15个循环。在另一方面，具有直径为130μm的拉制微丝表现出一大的熵变（ΔS _σ）达到10.3 J∙kg ^-1 ∙K ^-1，温度变化（ΔT）为4.5 K，疲劳速度快。此外，微线表现出较小的ΔT  = 3.0 K，具有高达275个循环的稳定性，可以进一步冷拔至直径80μm。拉伸微丝中弹性热效应的循环稳定性增强归因于冷拉伸引起的良好的晶粒取向和增强的屈服强度。这项工作对设计用于固态冷却应用的高性能基于铜的弹性材料具有指导意义。