Accommodation Mechanisms for Grain Boundary Sliding Some simultaneous accommodation mechanisms must operate to avoid the types of overlaps between sliding grains as shown in Fig. 1, and between a sliding grain and a blocking grain in front of the sliding grain. Accommodation mechanisms suggested in the literature of metallurgy and materials science are elastic distortion, dislocation movement and diffusion. The details of grain boundary openings will be explained later. Elastic distortion can accommodate grain boundary sliding by deforming sliding and blocking grains elastically. Accommodation mechanisms of grain boundary sliding.
Dotted lines represent deformation bands.
Dotted lines represent boundaries between grain mantle and core. Movements of dislocations in the mantle are schematically shown. To solve this problem, the accommodation can be considered in three ways. First, by comparing the contribution to the total strain, it can be said that the mechanism contributing less strain is the accommodation mechanism. Secondly, if two mechanisms contribute almost the same strain to the total strain, we may treat each deformation mechanism in a time sequence and a mechanism coming later is the accommodation mechanism.