Evolution Of Interfaces And Triple Junctions In Nanoscale Immiscible System

Interfaces and triple junctions in nanoscale immiscible system will migrate under high temperature. The issues of nano-multilayers thermal stability and grain shrinkage speedup in nano-film affected by this are concerned by researchers. The method of computer simulation is used by us to study the effects of interface energy anisotropy on nano-multilayers thermal stability and the effects of triple junction mobility and line tension on grain boundary migration in nano-film. Initial straight interface evolves into polygonal line, which minimizes the total interface energy under given interface energy anisotropy condition. The interface fluctuation period is estimated through the model of dislocation energy and corner forming energy at corners. The results above are in good accordance with experimental results. In the issue of nano-multilayers thermal stability dominated by grain boundary grooving, the method to decide whether the interface energy anisotropy accelerates or prevents grooving is proposed. In the process of cylindrical grain shrinkage in nano-film, lower triple junction mobility increases the probability of film pinch-off, and the effect of triple junction line tension dominates the speedup at the final stage. The functional relationship between grain boundary velocity and triple junction mobility is found, which contributes to getting triple junction mobility through experiments.