Order-disorder phase transitions in Fe81Ga19-RE ALLOYS (RE = Dy, Er, Tb, Yb) according to neutron diffraction data

A. M. Balagurov; Балагуров A. M.; B. Yerzhanov; Ержанов Б.; Б. Мухаметулы; Мухаметулы Б.; N. Yu. Samoylova; Самойлова Н. Ю.; V. V. Palacheva; Палачева В. В.; S. V. Sumnikov; Сумников С. В.; I. S. Golovin; Головин И. С.

doi:10.31857/S0015323024020113

Order-disorder phase transitions in Fe81Ga19-RE ALLOYS (RE = Dy, Er, Tb, Yb) according to neutron diffraction data

作者: Balagurov A.¹^,2, Yerzhanov B.¹, Мухаметулы Б.¹^,3^,4, Samoylova N.¹, Palacheva V.¹^,2, Sumnikov S.¹^,2, Golovin I.¹^,2
隶属关系:
1. Joint Institute for Nuclear Research
2. National Research Technological University “MISiS”
3. Al-Farabi Kazakh National University
4. Institute of Nuclear Physics of the Ministry of Energy of the Republic of Kazakhstan
期: 卷 125, 编号 2 (2024)
页面: 202-213
栏目: 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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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.

关键词

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

参考

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Emdadi A., Palacheva V.V., Balagurov А.M., Bobrikov I.A., Cheverikin V.V., Cifre J., Golovin I.S. Tb-dependent phase transitions in Fe-Ga functional alloys // Intermetallics. 2018. V. 93. P. 55–62.
Jin T., Wang H., Golovin I.S., Jiang C. Microstructure investigation on magnetostrictive Fe100-xGax and (Fe100-xGax)99.8Tb0.2 alloys for 19 ≤ x ≤ 29 // Intermetallics. 2019. V. 115. P. 106628.
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Order-disorder phase transitions in Fe81Ga19-RE ALLOYS (RE = Dy, Er, Tb, Yb) according to neutron diffraction data

全文:

详细

关键词

作者简介

A. Balagurov

B. Yerzhanov

Б. Мухаметулы

N. Samoylova

V. Palacheva

S. Sumnikov

I. Golovin

参考

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