Open AccessA first-principles study on the site occupancy behavior of transition metals in L12-Al3Li phase
Author(s) -
Ming Gao,
Yonghe Deng,
Dadong Wen,
Heping Zhao
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab8b1a
Subject(s) - density functional theory , transition metal , alloy , phase transition , phase (matter) , materials science , thermodynamics , chemistry , crystallography , computational chemistry , metallurgy , physics , biochemistry , organic chemistry , catalysis
The main strengthening mechanism in Al-Li alloys is generally achieved by the existence of a high volume fraction of the L1 2 -Al 3 Li precipitation from Al matrix. In this work, we do density functional theory (DFT) total energy calculations on the site occupancy behaviour of transition metals in L1 2 -Al 3 Li compound. The ground state properties of L1 2 -Al 3 Li, fcc-Al, and bcc-Li are determined and compared to the available literature data. The formation energies of intrinsic point defects in L1 2 -Al 3 Li phase as well as Al 3 LiX alloy formation energy are calculated and identified. We show that the Li antisite is preferential to from in the L1 2 -Al 3 Li phase. Finally, the site occupancy behaviour of transition metals in L1 2 -Al 3 Li as well as the solute atomic volume effect on the solute site preference and lattice expansion of the L1 2 -Al 3 Li have been studied, the later results can be used for an indirect estimation of the site substitution behaviour of the alloying elements in L1 2 -Al 3 Li phase.