A Monte-Carlo Simulation of Grain Boundary Character Distribution of HCP Materials

초록

A Monte-Carlo simulation method was developed to study the impact of Grain Boundary Character Distribution (GBCD) on grain growth and texture evolution in HCP materials. Simulated microstructures were constructed in which the texture of real material was closely re-generated. The method of microstructure generation consisted of experimental ODF and discretizing them into the simulated microstructure. For the range of c/a=1.55~1.633, GBCD of the CSL boundaries of up to was computed from randomly oriented microstructure. Distribution of the misorientation angles and the CSL boundaries agreed well with theoretical predictions in the literature. The result was checked with the experimental ODF of pure Ti, from which a conclusion was drawn in that the distribution frequency of 1 boundaries was high in the microstructure containing coarse grains of main texture components due to clustering. The orientation discretizing method was also applied to the case of Zr that has undergone equal-channel angular pressing(ECAP). The results of the analysis was consistent with the case of the real material, thus implying the potential effectiveness of the present methodology in other systems.