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Irradiation in BCC materials: Defect-induced changes of the effective dislocation mobility and their relation with the dose-dependent fracture response

Abstract : The mechanical response of nuclear structural materials and their lifetime are strongly affected by radiation effects. This influence is of concern, especially in body centered cubic (BCC) materials, which exhibiting a well-defined ductile to brittle transition. The ductile to brittle transition temperature (DBTT) itself is dose-dependent and may rise to or above the room temperature. In current work, the irradiation effect is modeled to predict the dose-dependent changes of the effective dislocation mobility, represented by the Defect Induced Apparent Temperature Shift (DDIAT). Mainly dislocation based crystal plasticity material model is used rather than a phenomenological approach. This material model accounts for both thermally activated dislocation mobility and dislocation mobility in an athermal regime of BCC materials. The defect-induced evolution of DDIAT in turn analyzed and their relations with the fracture response are highlighted and discussed.
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https://hal-cea.archives-ouvertes.fr/cea-03601054
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Submitted on : Tuesday, March 8, 2022 - 9:30:07 AM
Last modification on : Friday, March 11, 2022 - 3:27:34 AM
Long-term archiving on: : Thursday, June 9, 2022 - 6:56:07 PM

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Singh Kulbir, Christian Robertson, A.K. Bhaduri. Irradiation in BCC materials: Defect-induced changes of the effective dislocation mobility and their relation with the dose-dependent fracture response. Progress in Nuclear Energy, Elsevier, 2021, 141 (141), pp.103926. ⟨10.1016/j.pnucene.2021.103926⟩. ⟨cea-03601054⟩

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