富铁La(Fe,Al)13合金实现零热膨胀，抗拉强度提高

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-08-23 DOI:10.1016/j.jmmm.2025.173466

He Wang, Yuanyuan Gong, Ziqian Lu, Yihan Wang, Yuxuan Dai, Zhixiang Qi, Jun Liu, Feng Xu

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引用次数: 0

摘要

nazn13型La(Fe,Al)13基合金通过铝含量的变化表现出可调的各向同性负/零热膨胀（NTE/ZTE），但其实际应用仍然受到固有脆性的限制。在这项工作中，我们证明了通过固相反应合成富铁LaFe11.2+xAl1.8双相合金同时实现了广泛的ZTE和增强的力学性能。Fe的逐渐富集促进了nazn13型基体中α-Fe（Al）相的析出，有效抑制了基体在磁有序温度以下的NTE行为。LaFe19.2Al1.8实现了完全的NTE补偿，具有宽的中兴窗口（110-220 K）和接近于零的热膨胀系数（αl = 0.9 ppm/K）。关键是，分散的α-Fe（Al）相诱导析出强化，将优化后的组合物的抗拉强度提高到263 MPa，显著提高了机械加工性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Realization of zero thermal expansion and enhanced tensile strength in Fe-rich La(Fe,Al)13 alloys

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Realization of zero thermal expansion and enhanced tensile strength in Fe-rich La(Fe,Al)13 alloys

NaZn₁₃-type La(Fe,Al)₁₃-based alloys demonstrate tunable isotropic negative/zero thermal expansion (NTE/ZTE) through aluminum content variation, yet their practical implementation remains constrained by inherent brittleness. In this work, we demonstrate simultaneous achievement of wide ZTE and enhanced mechanical properties in Fe-rich LaFe_11.2+_xAl_1.8 dual-phase alloys via solid-state reaction synthesis. Progressive Fe enrichment promotes increased precipitation of α-Fe(Al) phases within the NaZn₁₃-type matrix, effectively suppressing NTE behavior of the matrix below the magnetic ordering temperature. The LaFe_19.2Al_1.8 composition achieves full NTE compensation, exhibiting a wide ZTE window (110–220 K) with near-zero thermal expansion coefficient (α_l = 0.9 ppm/K). Crucially, the finely dispersed α-Fe(Al) precipitates induce precipitation strengthening, elevating the tensile strength to 263 MPa in ZTE-optimized composition that significantly improves mechanical processability.

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.