Prediction of mechanical behaviors of radiated Fe-Cr alloys by plasticity theory

Abstract eng:
The mechanical behavior of non-irradiated and neutron irradiated Fe-Cr alloys is studied by means of a self-consistent plasticity theory, which accounts for the radiation-induced defects at the grain level by using an elastic-viscoplastic self-consistent method as the scale transition to obtain polycrystalline responses. Attention is paid to two types of radiation-induced defects: interstitial dislocation loops and solute rich clusters, which are the main sources of hardening in Fe-Cr alloys at medium irradiation doses. Both the hardening mechanisms and microstructure evolutions are investigated by a crystal plasticity model by using recently available experimental data on microstructures, and by implementing hardening rules on the basis of atomistic data. Dislocation loops are treated as strong thermally activated obstacles and solute rich clusters as weak precipitates that can break under shear. Good agreement with experimental data is achieved for both the yield stress and strain hardening of non-irradiated and irradiated Fe-Cr alloys.

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