ИССЛЕДОВАНИЕ ВЛИЯНИЯ ВЫСОКОГО ГИДРОСТАТИЧЕСКОГО ДАВЛЕНИЯ НА МЕХАНИЧЕСКИЕ СВОЙСТВА БИНАРНЫХ СПЛАВОВ Al-Cu

Abstract

In this paper, computer simulations of influence of high hydrostatic pressure on the mechanical properties such as elastic constants and moduli, intrinsic hardness and acoustic velocities of Al, Cu, CuAl3 and AlCu3 are provided. To simulate the energy of interaction in metals and alloys, the Sutton-Chen inter-atomic potential was used. The simulation was run using the geometry optimization method with the General Utility Lattice Program (GULP) 5.1. With increment of hydrostatic pressure, the values of mechanical characteristics increased sharply. The highest percentage of increase in the in the mechanical properties was shown in the pressure step from 0 to 100 GPa. On the pressure range [0, 100], the highest percentage of increase was shown on elastic constant C44 while the lowest percentage of increase was on the transversal acoustic velocity for aluminuim. As the amount of aluminium in the alloys increases, the longitudinal acoustic velocity reduced, while the elastic constants and moduli, as well as intrinsic hardness, increased.