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Ab initio determination of the elastic properties of ferromagnetic body-centered cubic Fe-Mn-Al alloys
Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Ctr Microstruct Sci, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China.;Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden..
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden..
Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Ctr Microstruct Sci, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China..
Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland..
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2015 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 118, no 10, 103904Article in journal (Refereed) Published
Abstract [en]

The elastic properties of ferromagnetic Fe1-x-yMnyAlx (0 <= x <= 0.5, y = 0, 0.1, and 0.2) random solid solutions in the body-centered cubic (bcc) crystallographic phase have been investigated using the ab initio exact muffin-tin orbitals method in combination with the coherent-potential approximation. Comparison with the experimental data demonstrates that the employed theoretical approach accurately captures the observed composition dependence of the lattice parameter. The predicted elastic parameters follow complex composition dependence. The C-11, C-12, and C' = (C-11 - C-12)/2 single-crystal elastic constants, the bulk (B), shear (G), and Young's (E) moduli, and the Cauchy pressure (C-12 - C-44) mainly decrease with increasing Al content, whereas the Zener anisotropy ratio (C-44/C') strongly increases with x. C-44 exhibits a non-linear x dependence. The Poisson (v) and Pugh (B/G) ratios first decrease with x but show non-monotonous behavior in high-Al alloys. In terms of the Pugh criterion, these trends suggest an increased brittleness in Al-containing alloys. Manganese has a complex non-monotonous effect on B/G in low-Al alloys (below similar to 15 at. % Al) but enhances the brittleness of the bcc solid solution in large-Al regime. The peculiar Mn alloying effect is explained in terms of magneto-volume mechanisms.

Place, publisher, year, edition, pages
2015. Vol. 118, no 10, 103904
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-264846DOI: 10.1063/1.4930162ISI: 000361636900019OAI: oai:DiVA.org:uu-264846DiVA: diva2:861750
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research EU, European Research Council
Available from: 2015-10-19 Created: 2015-10-19 Last updated: 2017-12-01Bibliographically approved

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Johansson, BorjeVitos, Levente

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