Composition- and temperature-dependent liquid structures in Al-Cu alloys: an ab initio molecular dynamics and x-ray diffraction study

X-ray diffraction study and molecular dynamic simulation of liquid Al-Cu alloys: a new data and interatomic potentials comparison

The experimental X-ray diffraction study of the Al[Formula: see text]Cu[Formula: see text] (at 1010 and 1310 [Formula: see text]C) and Al[Formula: see text]Cu[Formula: see text] (at 1100 and 1400 [Formula: see text]C) melts was performed. MD simulation of the Al[Formula: see text]Cu[Formula: see text], Al[Formula: see text]Cu[Formula: see text], Al[Formula: see text]Cu[Formula: see text], Al[Formula: see text]Cu[Formula: see text], Al[Formula: see text]Cu[Formula: see text], and Al[Formula: see text]Cu[Formula: see text] melts was carried out using several interatomic interaction potentials. It was found that the best agreement with experimental structural and transport data was achieved using the bond-order potential for the Al-Cu melts with predominant content of aluminum and embedded atom method potential for the Cu-based binary melts. The detailed analyses of short-range order in the Al-Cu melts were performed using partial structure factor and pair correlation function calculated from MD models. The formation of the chemical short-range order and medium-range order in the investigated melts was discussed.

Self-Diffusion in Liquid Copper, Silver, and Gold

The recently developed by us semi-analytical representation of the mean spherical approximation in conjunction with the linear trajectory approximation is applied to the quantitative study of self-diffusivities in liquid Cu, Ag and Au at different temperatures. The square-well model is employed for the description of the interatomic pair interactions in metals under study. It is found that our theoretical results are in good agreement with available experimental and computer-simulation data and can be considered as a prediction when such data are absent.