铁-镓合金中的四方相:定量研究

IF 3.1 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
A. M. Balagurov, I. A. Bobrikov, D. Yu. Chernyshov, A. S. Sohatsky, S. V. Sumnikov, B. Yerzhanov, I. S. Golovin
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引用次数: 0

摘要

目前,Fe-Ga 合金磁致伸缩增强形成的主要模型是基于合金立方基体中存在具有四方 L60 结构的微观夹杂物这一假设。然而,迄今为止还没有证据表明在合金块体中存在这种相,其数量足以对磁致伸缩的大小产生明显的影响。为了验证这一假设,我们在 ESRF 的高光子通量站对 Fe81Ga19Tb0.1 和 Fe73Ga27 单晶的倒易空间进行了详细扫描。特别是可以可靠地记录到超结构衍射峰,其强度与基本峰的强度相差 2×10-6。不过,既没有检测到明显属于 L60 相的超结构衍射峰,也没有检测到基本衍射峰的四方分裂成分,而这可能表明样品中存在该相。使用补充方法(电子衍射和中子衍射)也得到了类似的结果。根据对 L60 相上结构峰预期位置的背景水平进行的分析,发现该相在 Fe81Ga19Tb0.1 合金中的体积分数不能超过 0.2%。之前发现的具有六方或正方对称性的 X 相在含 27 at.%镓的晶体中存在六方或正方对称的 X 相。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Tetragonal phases in Fe-Ga alloys: A quantitative study

Tetragonal phases in Fe-Ga alloys: A quantitative study
Currently, the dominant model for the formation of enhanced magnetostriction of Fe-Ga alloys is based on the assumption of the presence of microscopic inclusions with a tetragonal L60 structure in the cubic matrix of the alloy. However, no evidence for the presence of this phase in the bulk of the alloys in amounts sufficient to have a noticeable effect on the magnitude of magnetostriction has been obtained so far. To test this hypothesis, a detailed scanning of the reciprocal space of Fe81Ga19Tb0.1 and Fe73Ga27 single crystals was carried out at ESRF at high photon flux stations. In particular, it was possible to reliably record superstructure diffraction peaks, the intensity of which was at a level of 2×106 from the intensity of the fundamental peaks. Nevertheless, neither the presence of superstructure diffraction peaks obviously belonging to the L60 phase nor the tetragonal splitting of the fundamental diffraction peaks into components, which could indicate the presence of this phase in the samples, was detected. Similar results were obtained using complementary methods (electron and neutron diffraction). Based on the performed analysis of the background level in the places of the expected positions of superstructure peaks of the L60 phase, it was found that the volume fraction of this phase in the Fe81Ga19Tb0.1 alloy cannot exceed 0.2 %. The presence of a previously discovered X phase with hexagonal or orthorhombic symmetry in a crystal with 27 at. % Ga was confirmed.
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来源期刊
Physical Review Materials
Physical Review Materials Physics and Astronomy-Physics and Astronomy (miscellaneous)
CiteScore
5.80
自引率
5.90%
发文量
611
期刊介绍: Physical Review Materials is a new broad-scope international journal for the multidisciplinary community engaged in research on materials. It is intended to fill a gap in the family of existing Physical Review journals that publish materials research. This field has grown rapidly in recent years and is increasingly being carried out in a way that transcends conventional subject boundaries. The journal was created to provide a common publication and reference source to the expanding community of physicists, materials scientists, chemists, engineers, and researchers in related disciplines that carry out high-quality original research in materials. It will share the same commitment to the high quality expected of all APS publications.
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