MSE Seminar: “Interactions btw Dislocation Loop and Point Defects in BCC Iron from Kinetic Monte Carlo Sims”

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HAIXUAN XU, PH.D.

ASSOCIATE PROFESSOR
DEPARTMENT OF MATERIALS SCIENCE AND ENGINEERING
UNIVERSITY OF TENNESSEE KNOXVILLE

ABSTRACT:

Dislocation loops play a critical role in irradiation-induced microstructural evolution of structural materials. Conventional understanding of the interaction between dislocations loops and point defects (PD), particularly at mesoscale, is challenging and limited.

In this study, the capture efficiency and bias factor of dislocation loops are determined using a recently developed method based on the lifetime of point defect computed using kinetic Monte Carlo simulations in a model bcc iron system. Bias factors and maximum swelling rate from this approach are compared with both neutron and ion-irradiation experiments and previous theoretical results. The effects of loop densities, loop sizes and temperatures are systematically examined. Comparative analysis of bias factors of dislocation loops and dislocations has also been carried out. This approach also applies to many other mesoscale processes and a variety of microstructure features, such as grain boundaries and interfaces.