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  • Ion irradiation damage effects
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main > scientific publications > e15 > ion irradiation damage effects
Ion irradiation damage effects
on the mechanical response of ferritic ODS alloy

R. Ghisleni, M.A. Pouchon, W.M.Mook, J.-C. Chen, W. Hoffelner, J. Michler

Ferritic oxide dispersion strengthened (ODS) steels, PM2000, are candidate materials for nuclear plants such as fission IV and fusion reactors due to their good mechanical properties at elevated temperatures. Since the ODS steels are based on iron, less helium embrittlement is expected in comparison to nickel based alloys. The determination of mechanical properties with sub-sized samples is a necessary requirement for the understanding of materials deformation from its very early phase to failure. The response of the microstructure to mechanical load is studied by observing the deformation of focussed ion beam machined micropillars loaded with a flat punch indenter inside a scanning electron microscope (SEM). The uniaxial microcompression test allows for a direct determination of the stress-strain response of the material. The micropillars fabricated have a 1 µm diameter and a 3 µm height. The irradiations were performed at room temperature with 1.5 MeV 4He2+ ions at different fluences ranging from 1.4 x 1016 to 11.2 x 1016 ions/cm2. The average yttria dispersoids size is evaluated to be 28 nm while the grain size is evaluated to be in the mm to cm range by microstructure analysis. The ion irradiated specimens showed increased yield strength when compared to unirradiated specimens. The results are discussed in terms of the effects of ion irradiation on the deformation mechanisms of ODS alloy.

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