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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Microstructure dependent thermal conductivity measurement of Zircaloy-4 using an extended Raman thermometry method
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Microstructure dependent thermal conductivity measurement of Zircaloy-4 using an extended Raman thermometry method

机译：使用延长拉曼温度法测定锆罗伊-4的微观结构依赖性导热率测量

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摘要

In this work, microstructural dependence of thermal conductivity of two polycrystalline zircaloy-4 samples was analyzed by using an extended Raman thermometry method. The thermal conductivity values in examined microstructures were found to vary spatially from 11 to 13 W m(-1)K(-1). These values are in the range reported by other bulk measurements that do not consider spatial distribution. The Kapitza thermal resistance model is shown to describe the measured dependence of thermal conductivity as a function of grain size. Thermal resistance from grain boundaries and inhomogeneities are identified as two potential contributors to the thermal conductivity reduction. Nanoindentation tests were performed to obtain the local elastic modulus distribution in the analyzed samples. The thermal conductivity values increase with elastic modulus increasing in each sample. This result indicates a possibility that at room temperature phonon thermal conductivity makes a non-negligible contribution to the total thermal conductivity in zircaloy-4. (C) 2020 Elsevier B.V. All rights reserved.
机译：在这项工作中，通过使用延长的拉曼温度法分析了两种多晶锆铝合金-4样品的热导率的微观结构依赖性。发现检查的微观结构中的导热率值在空间上差异为11至13Wm（-1）k（-1）。这些值在不考虑空间分布的其他批量测量的范围内。显示Kapitza热阻模型描述了作为晶粒尺寸的函数的导热率测量的测量依赖性。晶界和不均匀性的热阻被鉴定为导热率降低的两个潜在贡献者。进行纳米狭窄试验以获得分析的样品中的局部弹性模量分布。导热率值随每个样品中的弹性模量增加。该结果表明，在室温下，位于室温的热导率的可能性在锆罗伊-4中对总导热率的贡献是不可忽略的贡献。 （c）2020 Elsevier B.v.保留所有权利。

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