Golovin Igor S
National University of Science and Technology MISIS, Leninsky ave. 4, 119049 Moscow, Russia.
Moscow Polytechnic University, B. Semenovskay 38, 107023 Moscow, Russia.
Materials (Basel). 2023 Mar 15;16(6):2365. doi: 10.3390/ma16062365.
Fe-Ga alloys (GalFeNOLs) are the focus of attention due to their enhanced magneto-elastic properties, namely, magnetostriction in low saturation magnetic fields. In the last several years, special attention has been paid to the anelastic properties of these alloys. In this review, we collected and analyzed the frequency-, amplitude-, and temperature-dependent anelasticity in Fe-Ga and Fe-Ga-based alloys in the Hertz range of forced and free-decay vibrations. Special attention is paid to anelasticity caused by phase transitions: for this purpose, in situ neutron diffraction tests with the same heating or cooling rates were carried out in parallel with temperature dependencies measurements to control ctructure and phase transitions. The main part of this review is devoted to anelastic effects in binary Fe-Ga alloys, but we also consider ternary alloys of the systems Fe-Ga-Al and Fe-Ga-RE (RE-Rare Earth elements) to discuss similarities and differences between anelastic properties in Fe-Ga and Fe-Al alloys and effect of RE elements. We report and discuss several thermally activated effects, including Zener- and Snoek-type relaxation, several transient anelastic phenomena caused by phase transitions (D0 ↔ A2, D0 → L1, L1 ↔ D0, D0 ↔ B2, FeGa → L+FeGa phases), and their influence on the above-mentioned thermally activated effects. We also report amplitude-dependent damping caused by dislocations and magnetic domain walls and try to understand the paradox between the Smith-Birchak model predicting higher damping capacity for materials with higher saturation magnetostriction and existing experimental results. The main attention in this review is paid to alloys with 17-20 and 25-30%Ga as the alloys with the best functional (magnetostriction) properties. Nevertheless, we provide information on a broader range of alloys from 6 to 45%Ga. Due to the limited space, we do not discuss other mechanical and physical properties in depth but focus on anelasticity. A short introduction to the theory of anelasticity precedes the main part of this review of anelastic effects in Fe-Ga and related alloys and unsolved issues are collected in summary.
铁镓合金(GalFeNOLs)因其增强的磁弹性性能,即在低饱和磁场中的磁致伸缩,而备受关注。在过去几年中,这些合金的滞弹性性能受到了特别关注。在本综述中,我们收集并分析了铁镓及铁镓基合金在赫兹范围内强迫振动和自由衰减振动下与频率、振幅和温度相关的滞弹性。特别关注由相变引起的滞弹性:为此,在测量温度依赖性的同时,以相同的加热或冷却速率进行原位中子衍射测试,以控制结构和相变。本综述的主要部分致力于二元铁镓合金中的滞弹性效应,但我们也考虑了Fe-Ga-Al和Fe-Ga-RE(RE-稀土元素)体系的三元合金,以讨论铁镓合金和铁铝合金中滞弹性性能的异同以及稀土元素的影响。我们报告并讨论了几种热激活效应,包括齐纳和斯诺克型弛豫、由相变引起的几种瞬态滞弹性现象(D0 ↔ A2、D0 → L1、L1 ↔ D0、D0 ↔ B2、FeGa → L+FeGa相),以及它们对上述热激活效应的影响。我们还报告了由位错和磁畴壁引起的振幅依赖性阻尼,并试图理解史密斯-比尔查克模型预测饱和磁致伸缩较高的材料具有更高阻尼能力与现有实验结果之间的矛盾。本综述主要关注含17-20%和25-30%镓的合金,因为这些合金具有最佳的功能(磁致伸缩)性能。然而,我们提供了含6-45%镓的更广泛合金的信息。由于篇幅有限,我们没有深入讨论其他机械和物理性能,而是专注于滞弹性。在本关于铁镓及相关合金滞弹性效应的综述主要部分之前,先对滞弹性理论进行了简短介绍,并总结了未解决的问题。