Aluminum Materials, The Electric Field Energy Parameters Of The Thomas-fermi Model Calculation

Based on Thomas-Fermi model, the effect of external electric field on inner boundary potential was studied and the new atomic potential boundary condition was established. Thomas-Fermi model was extended to solid solution and compound with the volume adding method. The calculation method of the energy parameter for Al-Mg alloy, Al-Li-Cu alloy were derived out under the electric field and were calculated, the energy parameters such as free energy, Gibbs free energy, entropy and specific heat were studied systematically.The results show:The trendline of the energy parameter for Al-Mg alloy, Al-Li-Cu alloy at the electrode voltage were mainly same as at the boundary potential, but they were different about zero;The free energy of Mg₅Al₈ at 725K was more than at 460K;The free energy of Al-Mg solid solution increased with solubilities;The trendline of free energy for Mg₅Alg and Al-2.6wt.%Mg were different, Al-2.6wt.%Mg's free energy was more than Mg₅Al₈g's at 460K and it's less than Mg₅Alg's about zero and in the positive electric field at 725K;The trendline of free energy for Al-Li-Cu alloy were conformed to Al-Mg alloy;The free energy of Al-4.0wt.%Cu and Al-1.0wt.%Li were less than that of Al-4.0wt.%Cu-1.0wt.%Li.The entropy energy of Mg₅Al₈ at 725K was more than that at 460K, the extremum at 460K much approached to zero;The entropy energy of Al-Mg solid solution increased with solubilities;Al-2.6wt.%Mg's entropy energy was more than Mg₅Al₈'s at 460K and it's less than Mg₅Alg's about zero and in the positive electric field at 725K;The trendline of entropy energy for Al-Li-Cu alloy were conformed to Al-Mg alloy;The entropy energy of Al-4.0wt.%Cu was more than Al-4.0wt.%Cu-1.0wt.%Li at 725K, the entropy energy of Al-1.0wt.%Li was less than Al-4.0wt.%Cu-1.0wt.%Li at 725K.The trendline of Cibbs free energy and specific heat were conformed to free energy. Under the same electric field, Gibbs free energy was more than free energy atsame temperature. The numerical value of specific heat was 10¹0-l...