Preparing bulk Cu-Ni-Mn based thermoelectric alloys and synergistically improving their thermoelectric and mechanical properties using nanotwins and nanoprecipitates
Preparing bulk Cu-Ni-Mn based thermoelectric alloys and synergistically improving their thermoelectric and mechanical properties using nanotwins and nanoprecipitates
复制标题
制备块状 Cu-Ni-Mn 基热电合金并利用纳米孪晶和纳米沉淀物协同提高其热电和机械性能
DOI：
10.1016/j.mtphys.2020.100332
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发表时间：
2020-12
影响因子：
11.5
通讯作者：
Wang T.
中科院分区：
文献类型：
--
作者：
Kang H.;Yang Z.;Yang X.;Li J.;He W.;Chen Z.;Guo E.;Zhao L-D;Wang T.
Cu-Ni-Mn基合金由于其塞贝克效应和较大的功率因数，长期以来被认为是一种有潜力的热电材料。本研究通过熔炼和冷滚法制备了具有纳米结构的大块Cu-Ni-Mn基合金，并对其热电性能和力学性能进行了分析。透射电镜观察到合金中存在大量的纳米孪晶和纳米沉淀物。这些结果表明，采用传统的熔融-凝固-轧制工艺可以成功制备出具有纳米结构的大块Cu-Ni-Mn合金。含有纳米孪晶的Cu-Ni-Mn合金在1073 K时的塞贝克系数为~−72.8 μVK−1，功率因数为~ 11000 μWm−1K−2，因此具有较高的输出功率密度。含有纳米沉淀和纳米孪晶的大块zr掺杂Cu-Ni-Mn合金在773 K时的热导率为~ 32.9 Wm−1K−1，热导率为~ 0.22，高37.5%。增强的力学性能使Cu-Ni-Mn基合金成为热电应用的有前途的候选者。我们的发现为通过引入纳米孪晶和纳米沉淀物来改善高导热材料的热电和机械性能提供了一种有前途的策略。
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−1and power factor of ∼11000 μWm−1K−2at 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−1and a 37.5% higherZTof ∼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.
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DOI：
10.1073/pnas.1111419109
发表时间：
2012-06-19
影响因子：
11.1
作者：
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