Abstract Cu-Ni-Mn based alloys have long been considered as potential thermoelectric materials because of their Seebeck effect and large power factor. In this study, bulk Cu-Ni-Mn based alloys with nanostructures were prepared via melting and cryorolling, and their thermoelectric and mechanical properties were analyzed. A large number of nanotwins and nanoprecipitates were observed in the prepared alloys using transmission electron microscopy. These observations indicate that the bulk Cu-Ni-Mn alloys with nanostructures can be successfully prepared using conventional melting-solidification-rolling technology. The Cu-Ni-Mn alloy containing nanotwins exhibits a promising Seebeck coefficient of ∼ -72.8 μVK-1 and power factor of ∼ 11000 μWm-1K-2 at 1073 K, and thereby, a high output power density. The bulk Zr-doped Cu-Ni-Mn alloy containing nanoprecipitates and nanotwins exhibits a lower thermal conductivity of ∼ 32.9 Wm-1K-1 and a 37.5% higher ZT of ∼ 0.22 at 773 K. Enhanced mechanical properties make the Cu-Ni-Mn based alloys a promising candidate for thermoelectric application. Our discovery provides a promising strategy to improve the thermoelectric and mechanical properties of materials with high thermal conductivity through the introduction of nanotwins and nanoprecipitates.

中文翻译：

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制备块状 Cu-Ni-Mn 基热电合金并使用纳米孪晶和纳米沉淀协同改善其热电和机械性能

摘要 Cu-Ni-Mn基合金由于具有塞贝克效应和大功率因数等优点，长期以来被认为是具有潜力的热电材料。在这项研究中，通过熔化和冷轧制备了具有纳米结构的块状 Cu-Ni-Mn 基合金，并分析了它们的热电和机械性能。使用透射电子显微镜在制备的合金中观察到大量纳米孪晶和纳米沉淀物。这些观察结果表明，使用传统的熔融-凝固-轧制技术可以成功制备具有纳米结构的块状 Cu-Ni-Mn 合金。含有纳米孪晶的 Cu-Ni-Mn 合金在 1073 K 时表现出良好的赛贝克系数 -72.8 μVK-1 和 - 11000 μWm-1K-2 的功率因数，从而具有高输出功率密度。含有纳米沉淀物和纳米孪晶的块状 Zr 掺杂的 Cu-Ni-Mn 合金表现出较低的热导率，约为 32.9 Wm-1K-1，在 773 K 时的 ZT 增加了 37.5%，约为 0.22。增强的机械性能使 Cu-Ni- Mn 基合金是热电应用的有希望的候选者。我们的发现提供了一种有前景的策略，通过引入纳米孪晶和纳米沉淀来改善具有高导热性的材料的热电和机械性能。