|Lattice parameters and relative stability of alpha '' phase in binary titanium alloys from first-principles calculations|
|C. X. Li; H. B. Luo; Q. M. Hu; R. Yang; F. X. Yin; O. Umezawa; L. Vitos
|Source Publication||Solid State Communications
|Abstract||The crystallographic structure and stability of the alpha" phase relative to the alpha and beta phases in Ti-x M (M=Ta, Nb, V, Mo) alloys are investigated by using the first-principles exact muffin-tin orbital method in combination with the coherent potential approximation. We show that, with increasing concentration of the alloying elements, the structure of the orthorhombic-alpha'' phase evolutes from the hcp-alpha to the bcc-beta phase, i.e., the lattice parameters b/a and c/a as well as the basal shuffle y decreases from those corresponding to the alpha phase to those of the beta phase. The compositional alpha/alpha" and alpha"/beta phase boundaries are determined by comparing the total energies of the phases. The predicted alpha/alpha" phase boundaries are about 10.2, 10.5, 11.5, 4.5 at% for Ti-V, Ti-Nb, Ti-Ta, and Ti-Mo, respectively, in reasonable agreement with experiments. The alpha"/beta phase boundaries are higher than the experimental values, possibly due to the absence of temperature effect in the first-principles calculations. Analyzing the electronic density of states, we propose that the stability of the alpha" phase is controlled by the compromise between the strength of the covalent and metallic bonds. (C) 2013 Elsevier Ltd. All rights reserved.|
; umezawa, osamu] yokohama natl univ, dept mat sci & engn, yokohama, kanagawa 2458501, japan. [luo, hu-bin
; hu, qing-miao
; yang, rui] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [li, chun-xia
; yin, fu-xing] natl inst mat sci, met proc grp, tsukuba, ibaraki 3050047, japan. [vitos, levente] royal inst technol, dept mat sci & engn, se-10044 stockholm, sweden. [vitos, levente] uppsala univ, dept phys & astron, div mat theory, se-751210 uppsala, sweden. [vitos, levente] wigner res ctr phys, res inst solid state phys & opt, h-1525 budapest, hungary.
; hu, qm (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china.
C. X. Li,H. B. Luo,Q. M. Hu,et al. Lattice parameters and relative stability of alpha '' phase in binary titanium alloys from first-principles calculations[J]. Solid State Communications,2013,159:70-75.
C. X. Li.,H. B. Luo.,Q. M. Hu.,R. Yang.,F. X. Yin.,...&L. Vitos.(2013).Lattice parameters and relative stability of alpha '' phase in binary titanium alloys from first-principles calculations.Solid State Communications,159,70-75.
C. X. Li,et al."Lattice parameters and relative stability of alpha '' phase in binary titanium alloys from first-principles calculations".Solid State Communications 159(2013):70-75.
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