Abstract
In present study, grain boundary engineering has been processed on equiatomic CoCrFeMnNi, CoCrFeNi, and FeCoNi alloys. Special boundary fraction, twin density, grain size distribution and misorientation distribution have been evaluated by EBSD. Experimental results indicate that FeCoNi exhibits the highest special boundary fraction and twin density for one-step recrystallization, while CoCrFeNi exhibits the highest special boundary fraction and twin density for one-step and iterative strain annealing. The special boundary increment of one-step recrystallization is mainly affected by grain boundary velocity, while twin density of one-step recrystallization is mainly affected by average grain boundary energy and twin boundary energy. The special boundary increment and twin density for one-step and iterative strain annealing are mainly affected by grain boundary velocity, nontwin Σ3 boundary, severe-lattice-distortion effect, and sluggish-diffusion effect.