Atomic-scale modeling of nanostructure formation in Fe–Ga alloys with giant magnetostriction: Cascade ordering and decomposition

Structure and properties of high damping Fe-Ga based alloy

“…With increase of static stress MDs adjust their shape and volume to applied stress: their mobility under cyclic stress becomes lower and damping decreases. Highest damping at three point bending (tan ϕ ≈ 0.05) is recorded for binary (18)(19) %Ga alloys. Free decay tests give damping nearly twice higher than forced bending vibrations in cantilever mode.…”

“…6d -SEM). Even this transition is diffusion controlled, elements of a displacive shear transformation are involved due to loss of stability or buckling {110}<110> of the D0 3 phase with formation of metastable closed packed structure [18][19][20]. The Bain strain is required for the diffusionless part of cubic to tetragonal displacive transformation that brings the structure closer to an equilibrium fcc-based L1 2 ordered phase.…”

Diffusionless nature of D0 3 → L1 2 transition in Fe 3 Ga alloys

“…The D0 3 to L1 2 transition cannot occur only by an atomic exchange between the sites; however, a diffusionless displacive bcc→fcc reconstruction was proposed [10,11]: the atomic order inherited from the D0 3 phase corresponds to a transformed tetragonal (D0 22 structure) lattice and the corresponding Bain strain transforms the bcc lattice further into a fct lattice bringing Fe and Ga atoms to their new positions in an fcc-based lattice without an atomic interchange between these sites. The Bain orientation relations between the parent bcc-based D0 3 D022 , and (010) D03 ║ (110) D022 .…”

Effect of magnetism on the solution energy of 3p (Al, Si) and 4p (Ga, Ge) elements in iron

“…Therefore, the consistent description of iron alloys requires a tran sition onto a microscopic level with allowance for the electronic structure and magnetic state. This approach has been realized in recent works [4,9,10,[22][23][24], where the impact of magnetism on the solubility of alloying ele ments and phase equilibrium has been shown.…”