Dislocation mechanism of size effects in alloys

Prof Akiyuki Takahashi

Department of Mechanical and Aerospace Engineering, Tokyo University of Science

Abstract: As the material size decreases to the micro- or nano-scale, traditional bulk material behavior no longer applies and different deformation mechanisms become dominant. The phenomenon is commonly called size effects. In recent years, experimental studies on the size effects in alloys have been extensively conducted. To investigate the dislocation mechanism underlying the size effects in alloys, we are developing a computational method to model the interaction between dislocations and multiple precipitates with arbitrary shapes and distributions. By integrating this dislocation-precipitate interaction method with the superposition principle, which accounts for free surface effects in dislocation simulations, we enable the simulation of size effects in alloys. In this lecture, we will discuss the computational method and the dislocation mechanism underlying the size effects, particularly in alloys.

Bio: 

Name: Akiyuki Takahashi 

Affiliation: Department of Mechanical and Aerospace Engineering, Tokyo University of Science 

Position: Professor Academic degree: Dr. (Eng) (From University of Tokyo, 2003) 

Research Interest: Computational materials science, Dislocation dynamics simulations, Meso-scale mechanism of plasticity, Physics of defects.