Crystal Defect on Melting Point of Nickel and Aluminum

Abstract

Imperfection in the regular geometrical arrangement of the atoms in a crystalline solid is known as crystal defect. These imperfections result from deformation of the solid, rapid cooling from high temperature, or high-energy radiation striking the solid. Located at single points, along lines, or on whole surfaces in the solid, these defects influence its Physical, mechanical, electrical, and optical behavior. So the temperature effects of crystal on noble metals such as nickel and aluminum with planar and point defects play a key role in materials science. To compute the energy per atom and lattice parameter, the semi empirical potential which base on embedded atom method (EAM) to find melting point. On melting point, the including self, point defects effects, interstitial and substitution have obtained. The effect of twin interfaces and twin formation energy of low index (111), (112), (113) and (114) on melting point of Nickel and Aluminum has a high twin-forming energy with a low planar atomic density. The current twin interface results are acceptable in the sense that all occurring atomic relaxations are consistent with what might be expected using a hard sphere model. It is noticed that defect free crystal which have pointed the melting point, the existence of defect (planer / point) lowers the melting point of metals.