Method for Evaluating Irradiation Effects on Flow Stress in Fe-9%Cr ODS Using TEM In Situ Cantilevers
Method for Evaluating Irradiation Effects on Flow Stress in Fe-9%Cr ODS Using TEM In Situ Cantilevers
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DOI：
10.1007/s11837-020-04110-x
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发表时间：
2020-04
期刊：
影响因子：
2.6
通讯作者：
K. Yano;Yaqiao Wu;J. Wharry
中科院分区：
文献类型：
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作者：
K. Yano;Yaqiao Wu;J. Wharry
透射电子显微镜原位力学测试已成为同时测量辐照材料和核材料的力学性能和了解基本变形机制的一种广泛使用的工具。虽然拉伸和压缩试件的几何形状是最常见的，但仍有机会研究替代的几何形状，这些几何形状可以为辐照材料的可塑性提供独特的见解。这项工作展示了一种新的瞬变电磁原位悬臂梁结构。悬臂梁由接收的和质子辐照(1 dpa，500°C)Fe-9%Cr氧化物弥散强化钢生产。用透射电子显微镜原位深度传感力学测试夹持器测量流动应力。测量到由于辐射，流动应力增加了200兆帕。当内部(即微结构)尺寸接近外部(即外部尺寸)尺寸时，尺寸效应出现，并且可以使用作为材料微结构和悬臂尺寸的函数的幂定律关系来描述。
Transmission electron microscopic (TEM) in situ mechanical testing has become a widely utilized tool for simultaneously measuring mechanical properties and understanding fundamental deformation mechanisms in irradiated and nuclear materials. Although tensile and compression specimen geometries are among the most common, opportunities remain for investigating alternative geometries that could provide unique insights into the plasticity of irradiated materials. This work demonstrates a new TEM in situ cantilever beam configuration. Cantilevers are produced from as-received and proton-irradiated (1 dpa, 500°C) Fe-9%Cr oxide dispersion-strengthened steel. Flow stress is measured using a TEM in situ depth-sensing mechanical testing holder. A 200-MPa increase in flow stress is measured due to irradiation. Size effects arise when the intrinsic (i.e., microstructural) size approaches the extrinsic (i.e., external dimensions) size and can be described using a power law relationship as a function of the material microstructure and cantilever dimensions.