Advanced Study Group Diffusion and Microstructure Analysis (DMA)
Diffusionless nature of D03 → L12 transition in Fe3Ga alloys
I. S. Golovin, V. V. Palacheva, A. I. Bazlov, J. Cifre, N. Nollmann, S. V. Divinski, G. Wilde.
Journal of Alloys and Compounds, 656, 897-902, (2016)
Temperature dependent internal friction is studied in an Fe3Ga alloy using a dynamical mechanical analyzer. Apart from several thermally activated relaxation peaks with the Arrhenius parameters (activation energies of 1.05 and 1.85 eV and a pre-factor τ0 ≈ 10−15s) featuring a Snoek-type and Zener relaxation, respectively, a transient internal friction peak related to a structural transition upon heating is found and analyzed in detail. This peak substantiates an irreversible transition from a D03 ordered bcc to an L12 ordered fcc lattice, as further confirmed by in situ X-ray diffraction measurements. The transient peak is unambiguously shown to feature a diffusionless phase transition.