Abstract
In this paper, a crystal plasticity model considering the irradiation effect based on the thermal activation theory is established. The evolutions of screw dislocations, edge dislocations, and stacking fault tetrahedrals (SFTs) (induced by irradiation) are included into the model. The interactions between dislocations and irradiation-induced SFTs are also considered. The constitutive model is numerically implemented on the ABAQUS platform through UMAT subroutine and applied to study the irradiation effect on the mechanical behavior of pure copper. The mechanical properties of single and polycrystalline copper are studied, and the simulation results show that the constitutive model can properly predict the mechanical behavior of irradiated pure copper. Especially for polycrystalline copper, the simulation results are in good agreement with the experimental data.
Highlights
IntroductionThe mechanical properties of metal materials are influenced by irradiation and temperature
In nuclear industry, the mechanical properties of metal materials are influenced by irradiation and temperature
Aαe = 2dqYeα here Y α is the mean free path of the dislocation segment, which is defined as the moving distance of the segment before arrested by forest dislocations (Yeα is for edge dislocation and Ysα is for screw dislocation)
Summary
The mechanical properties of metal materials are influenced by irradiation and temperature. Metal materials with different crystal structures always show an irradiation effect, i.e., a significant increase in yield strength and a decrease in toughness [1, 2]. The deformation mechanism of the irradiated FCC materials is greatly affected by the dislocations and irradiation defects. Though the irradiation effect has not been considered, the evolution model of screw and edge dislocations is useful for studying the mechanical behavior of FCC crystal. It was concluded that irradiation-induced defects could affect the mechanical behavior and texture evolution of metals, both of which were closely related to irradiation hardening. A crystal plasticity model considering irradiation effect is established by tracking the evolutions of screw dislocations, edge dislocations, and SFTs induced by the irradiation. The mechanical behaviors of single and polycrystalline copper before and after irradiation are studied and predicted
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