Influence of initial state and heating rate on phase transformation in Fe66Ga34 alloy
Vershinina T.N. Yerzhanov B. Palacheva V.V. Hao J.Z. Lu H.L. He L.H. Balagurov A.M. Golovin I.S.
10 September 2025Elsevier Ltd
Journal of Alloys and Compounds
2025#1039
The influence of phase composition and heating rate on the character of phase transformations and the composition of the resulting structural phases was analyzed using neutron diffraction. This comparative study were carried out on a pulsed neutron source CSNS (China) on the General Purpose Powder Diffractometer (GPPD). Phase transformations in the Fe66Ga34 alloy have been analyzed by in situ real-time neutron diffraction in the temperature range from 20 to 880°C with constant heating rates of 2 and 10 °C/min and temporal resolution of about 4 min. It is shown that a decrease in the cooling rate of the alloy leads to the formation of an equilibrium phase α-Fe6Ga5, the presence of which significantly affects the character of subsequent phase transformations. The maximum temperature of the metastable Fe13Ga9 phase existence does not depend on the presence or absence of the equilibrium α-Fe6Ga5 phase, but increases with increasing heating rate. The Curie temperature for the Fe13Ga9 phase has been estimated for the first time as TC = 380°C. At this temperature a jump in the volume of the unit cell of this phase occurs, which may indicate the presence of negative spontaneous volume magnetostriction.
Fe-Ga alloys , Neutron diffraction , Phase transformation
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Joint Institute for Nuclear Research, Dubna, Russian Federation
Dubna State University, Dubna, Russian Federation
National University of Science and Technology “MISIS”, Moscow, Russian Federation
Nuclear Physics Institute of the Ministry of Energy of the Republic of Kazakhstan, Almaty, Kazakhstan
Spallation Neutron Source Science Center, Dongguan, China
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
Songshan Lake Materials Laboratory, Dongguan, China
Lomonosov Moscow State University, Moscow, Russian Federation
Joint Institute for Nuclear Research
Dubna State University
National University of Science and Technology “MISIS”
Nuclear Physics Institute of the Ministry of Energy of the Republic of Kazakhstan
Spallation Neutron Source Science Center
Institute of High Energy Physics
Beijing National Laboratory for Condensed Matter Physics
Songshan Lake Materials Laboratory
Lomonosov Moscow State University
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