Free Energy Calculation of Al-Li-Mg Alloy from Electron Level

Author

Jian-jun, Zhang ; Zheng, Chen ; Yong-xin, Wang

Author_Institution

Sch. of Energy & Power Eng., North China Electr. Power Univ. Beijing, Beijing, China

fYear

2011

fDate

19-20 Feb. 2011

Firstpage

219

Lastpage

222

Abstract

Based on Thomas-Fermi model, the calculation method of free energy for atom cluster with electric field had been found. The change trend of free energy of Al-Li-Mg alloy under the effect of electric field had been calculated systemically and quantitatively. And following results had been given: mostly the free energy of Al₃Li and Mg₅Al₈ at aging temperature is lower than that of free energy at solid solution temperature, but once the negative electric field increased to certain degree there will be opposite result. At aging temperature, the free energy of Al₃Li and Mg₅Al₈ are lower than that of Al-2.14wt.%Li and Al-2.6wt.%Mg. And comparing with 1420 alloy, the electric field promotes the precipitation of Al₃Li and restrains the precipitation of Mg₅Al₈.

Keywords

Thomas-Fermi model; ageing; aluminium alloys; electric field effects; free energy; lithium alloys; magnesium alloys; solid solutions; 1420 alloy; Al-Li-Mg; Al-Li-Mg alloy; Thomas-Fermi model; aging temperature; atom cluster; electron level; free energy calculation; negative electric field; precipitation; solid solution temperature; Computers; Decision support systems; Distributed control; Monitoring; Al-Li-Mg alloy; Thomas-Fermi model; electric field; free energy;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer Distributed Control and Intelligent Environmental Monitoring (CDCIEM), 2011 International Conference on

Conference_Location

Changsha

Print_ISBN

978-1-61284-278-3

Electronic_ISBN

978-0-7695-4350-5

Type

conf

DOI

10.1109/CDCIEM.2011.44

Filename

5747801