Email this article Order-disorder phase transitions in Fe81Ga19-RE ALLOYS (RE = Dy, Er, Tb, Yb) according to neutron diffraction data
- Authors: Balagurov A.M.1,2, Yerzhanov B.1, Мухаметулы Б.1,3,4, Samoylova N.Y.1, Palacheva V.V.1,2, Sumnikov S.V.1,2, Golovin I.S.1,2
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Affiliations:
- Joint Institute for Nuclear Research
- National Research Technological University “MISiS”
- Al-Farabi Kazakh National University
- Institute of Nuclear Physics of the Ministry of Energy of the Republic of Kazakhstan
- Issue: Vol 125, No 2 (2024)
- Pages: 202-213
- Section: СТРУКТУРА, ФАЗОВЫЕ ПРЕВРАЩЕНИЯ И ДИФФУЗИЯ
- URL: https://journals.rcsi.science/0015-3230/article/view/264423
- DOI: https://doi.org/10.31857/S0015323024020113
- EDN: https://elibrary.ru/YORFPB
- ID: 264423
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Abstract
New data on the phase compositions and structural transformations in a number of Fe81Ga19 alloys doped with trace amount (≤ 0.2 at.%) of rare earth elements are presented. The data are obtained in neutron diffraction experiments performed with high resolution and in continuous temperature scanning mode when heated to 900 °C and subsequent cooling. It has been established that structural rearrangements proceed in a generally identical manner both in the original Fe81Ga19 alloy and in its doped analogues. Slow heating and subsequent cooling of the alloys (rate ±2 °C/min) leads to the formation of clusters of the D03 phase with sizes in the range (200–300) Å in the matrix of the disordered A2 phase. The sizes and volume fraction of clusters (~0.3 of the sample volume) weakly depend on the specific composition. The degree of ordering of the clusters atomic structure changes with temperature according to a second-order phase transition and is close to unity at room temperature. The search for structural ordering corresponding to the modified D03 phase, discovered in a number of electron diffraction studies, did not lead to a positive result.
About the authors
A. M. Balagurov
Joint Institute for Nuclear Research; National Research Technological University “MISiS”
Email: bekarys@jinr.ru
Russian Federation, Dubna, 141980; Moscow, 119049
B. Yerzhanov
Joint Institute for Nuclear Research
Author for correspondence.
Email: bekarys@jinr.ru
Russian Federation, Dubna, 141980
Б. Мухаметулы
Joint Institute for Nuclear Research; Al-Farabi Kazakh National University; Institute of Nuclear Physics of the Ministry of Energy of the Republic of Kazakhstan
Email: bekarys@jinr.ru
Russian Federation, Dubna, 141980; Almaty, 050040 Kazakhstan; Almaty, 050032 Kazakhstan
N. Yu. Samoylova
Joint Institute for Nuclear Research
Email: bekarys@jinr.ru
Russian Federation, Dubna, 141980
V. V. Palacheva
Joint Institute for Nuclear Research; National Research Technological University “MISiS”
Email: bekarys@jinr.ru
Russian Federation, Dubna, 141980; Moscow, 119049
S. V. Sumnikov
Joint Institute for Nuclear Research; National Research Technological University “MISiS”
Email: bekarys@jinr.ru
Russian Federation, Dubna, 141980; Moscow, 119049
I. S. Golovin
Joint Institute for Nuclear Research; National Research Technological University “MISiS”
Email: bekarys@jinr.ru
Russian Federation, Dubna, 141980; Moscow, 119049
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