材料期刊网

The melting transition in three high-energy and two low-energy fee Cu symmetrical tilt grain boundaries (STGBs) has been investigated by molecular-dynamics (MD) simulations. Low-energy STGBs are found to be crystalline from room temperature all the way up to T-0 (T-0 is the thermodynamic equilibrium melting point). In contrast, all high-energy STGBs undergo premelting which is initiated at a transition temperature T-c (T-c < T-0). Moreover, the higher the zero-temperature GB energy, the lower the T-c.