転位－析出物相互作用における析出物形状の影響の転位動力学解析

抄録

Dislocation-precipitate interactions play an important role in determining the strength of alloys. Alloys can be strengthened by adding additive elements to the crystal and heat-treating to form precipitates, which hinder the movement of dislocations, suppress plastic deformation, and strengthen the metallic material. It is known that the coherency strain caused by the difference in lattice constants between the matrix and the precipitates affects the behavior of dislocations by producing a stress field around the precipitates. Various shapes of precipitates have been observed. In this study, a dislocation-precipitate interaction analysis considering the precipitate shape is performed using a hybrid computational method of the s-version finite element method and the dislocation dynamics method. The effect of precipitate shape on the critical resolved shear stress required for dislocations to shear the precipitate was investigated by calculating the stress field under coherency strain for spherical, disk, and cubic precipitate shapes.