Phase States and Structural Phase Transitions in Fe73Ga27RE0.5 (RE = Dy, Er, Tb, Yb) Alloys: A Neutron Diffraction Study


Balagurov A.M. Yerzhanov B. Mukhametuly B. Samoylova N.Y. Palacheva V.V. Sumnikov S.V. Golovin I.S.
May 2024Pleiades Publishing

Physics of Metals and Metallography
2024#125Issue 5525 - 534 pp.

Abstract—: New data on phase states and structural phase transitions in alloys Fe73Ga27 doped with Dy, Er, Tb, and Yb in an amount of about 0.5 at % are presented. Structural data were obtained in neutron diffraction experiments performed with high resolution and in continuous temperature scanning mode during heating to 850°C and subsequent cooling at a rate of ±2°C/min. It has been established that both the sequence of forming and disappearing structural phases and the final state of the alloy depend on the type of rare earth element. Phase transitions in the alloy with Dy are similar to those in the initial Fe73Ga27 alloy, excluding the final state. The procedure of doping with Er and Tb leads to the formation of disordered A1 and A3 phases instead of the L12 and D019 ordered close packed phases, respectively. In the case of doping with Yb, neither of the above phases is observed. The formation of the L60 (m-D03) and D022 tetragonal structural phases previously discovered in similar alloys by the electron diffraction method is not confirmed.

Fe–Ga alloys , magnetostriction , neutron diffraction , rare earth elements , structural phase transitions

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Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
National Research Technological University MISiS, Moscow, 119049, Russian Federation
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan, Almaty, 050032, Kazakhstan

Joint Institute for Nuclear Research
National Research Technological University MISiS
Al-Farabi Kazakh National University
Institute of Nuclear Physics

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