The Fe–Ga phase diagram: Revisited

Composition dependence of tracer diffusion coefficients in Fe–Ga alloys: A case study by a tracer-diffusion couple method

“…While Fe diffusion can straightforwardly be measured using the radiotracer technique and applying the relatively long-lived (half-life of 45 d) 59 Fe isotope [29], Ga offers only two suitable and relatively short-living radioisotopes, 67 Ga (half-life of 3 d) and 72 Ga (halflife of 14 h) that hinders reliable diffusion measurements especially at moderate and lower temperatures. As discussed in this article, we solve this issue for the estimation of tracer diffusion coefficients of both the components at a relatively high temperature of 1143 K in a single-phase region of the binary Fe-Ga system [30] by following the tracer-interdiffusion couple technique.…”

Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review

“…Boundary between these groups cannot be defined precisely as the first-order transitions are controlled by both temperature and time. It was recently proved that long-term aging (300–1800 h) below 600 °C leads to the A2 (or D0 3 ) to A1 (or L1 2 ) transition even in the alloys with 16–17%Ga [ 16 , 17 ], while in experiments with the constant heating and cooling rate (1–2 K/min), these transitions take place only in the alloys with 24–25%Ga and more [ 19 , 49 , 60 , 61 ].…”

“…Moreover, the study and interpretation of microstructures of Fe–Ga alloys with Ga > 30% are in particular hampered by contradictory phase diagrams: proposed by Kubashewski [ 15 ], Köster and Gödecke [ 14 ], Okamoto [ 133 ], and Bras [ 134 ] with respect to so-called M, R, H, and α- and β-Fe 6 Ga 5 phases presented in these diagrams [ 11 ]. Our recent structural studies bring some light to the phase transitions in high-Ga alloys [ 11 , 16 ] and help to interpret anelastic effects in high-Ga alloys. In particular, phase transitions at instant heating for 31–45%Ga alloys were reported using in situ neutron diffraction studies up to 850 °C by Vershinina et al [ 26 , 27 , 135 ], which helps to interpret transient effects in the same alloys related to the appearance of the Fe 13 Ga 9 , α- and β-Fe 6 Ga 5 phases, and to predict new and still unreported anelastic effects.…”

“…Fe–Ga alloys are also known for their ordering of Ga atoms in fcc (A1), bcc (A2), and hcp (A3) iron: the type of order depends on temperature range and %Ga atoms. Most recently, the equilibrium Fe–Ga phase diagram proposed by T. Gödecke and W. Köster [ 14 ] and adopted by O. Kubaschewski [ 15 ] was corrected in the temperature range below 600 °C to extend the range of the L1 2 phase [ 16 , 17 ].…”

Кинетика структурных фазовых переходов в сплаве Fe-=SUB=-80.5-=/SUB=-Ga-=SUB=-19.5-=/SUB=-

“…В работе [7] исследована структура и фазовый состав сплавов Fe 100−x Ga x с содержанием Ga от 15 до 45 at.% в зависимости от влияния длительного отжига диапазоне температур 300−600 • С. Показано, что фаза А2 является преобладающей в интервале концентраций 15 < x < 21, фаза L1 2 -в интервале концентраций 21 < x < 33, тогда как при большем содержании Ga появляется смесь фаз Fe 6 Ga 5 , α-Fe 6 Ga 5 и β-Fe 6 Ga 5 . Исследование кинетики протекания фазовых переходов для сплавов Fe-Ga с содержанием галлия 17.5−19.5 at.% представлено в работе [8].…”