Abstract
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.
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Acknowledgements
This research was sponsored in part by the National Science Foundation CAREER award DMR-17-52636 (JPW), and the US DOE Office of Nuclear Energy project DE-NE0008758 (KHY). Microscopy work was supported by the US DOE Nuclear Science User Facilities experiments 15-540, 16-656, and 18-1168. The authors thank J. Burns and J. Taylor in the Microscopy and Characterization Suite (MaCS) at CAES for their assistance with FIB and TEM, J. Noble from Bruker with the setup and operation of the PI95, and Matthew Swenson at the University of Idaho for many thought-provoking technical discussions. The authors also acknowledge the staff and students at the Michigan Ion Beam Laboratory for their assistance with ion irradiation.
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Yano, K.H., Wu, Y.Q. & Wharry, J.P. Method for Evaluating Irradiation Effects on Flow Stress in Fe-9%Cr ODS Using TEM In Situ Cantilevers. JOM 72, 2065–2074 (2020). https://doi.org/10.1007/s11837-020-04110-x
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DOI: https://doi.org/10.1007/s11837-020-04110-x