Superheated melting of grain boundaries

Based on a model of the melting of grain boundaries (GB), we discuss the possibility of the existence of a superheated GB state. The molecular dynamics simulation presented here shows that the superheated GB state can be realized in the high symmetric tilt GB. The sizes of liquid nuclei exceeding a critical size determined whether or not the superheating grain boundary melted. Our results also indicate that an increase of the melting point due to pressure is smaller than the superheating due to a nucleation mechanism.