Method for Fabricating Depth-Specific TEM In Situ Tensile Bars
Method for Fabricating Depth-Specific TEM In Situ Tensile Bars
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DOI：
10.1007/s11837-020-04105-8
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发表时间：
2020-03
期刊：
影响因子：
2.6
通讯作者：
Patrick H. Warren;George Warren;Megha Dubey;Jatuporn Burns;Yaqiao Wu;J. Wharry
中科院分区：
文献类型：
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作者：
Patrick H. Warren;George Warren;Megha Dubey;Jatuporn Burns;Yaqiao Wu;J. Wharry
越来越多地使用离子辐照来评估核材料的降解，这就需要开发新的方法来探索浅层离子辐照的机械响应。透射式电子显微镜的原位力学测试可以将离子辐照后的涂层与未辐照的衬底隔离开来。然而，缺乏从需要特定深度检查的块状材料制备透射电子显微镜原位机械测试样品的既定程序，例如，离子辐照损伤轮廓上的目标剂量。本研究展示了一种从Fe-5wt.%Mo块体样品中提取深度特定的透射电子显微镜原位拉力棒的新方法。测得的屈服应力、极限拉应力、杨氏模量和伸长率与尺寸相近的Fe和Mo单晶纳米线的性能一致。结果在样品尺寸效应的背景下进行了讨论。
The growing use of ion irradiation to assess degradation of nuclear materials has created a need to develop novel methods to probe the mechanical response of shallow ion-irradiated layers. Transmission electron microscopy (TEM) in situ mechanical testing can isolate the ion-irradiated layer from its unirradiated substrate. However, there is a lack of established procedures for preparing TEM in situ mechanical testing specimens from bulk materials requiring depth-specific examination, e.g., target dose on the ion irradiation damage profile. This study demonstrates a new method for extracting depth-specific TEM in situ tensile bars from a bulk specimen of Fe-5 wt.%Mo. Measured yield stress, ultimate tensile stress, Young’s modulus, and elongation are consistent with those properties obtained from similarly sized Fe and Mo single-crystal nanowires. Results are discussed in the context of the specimen size effect.