In-situ synthesizing nanoscale (Zr,Ti)B2 at intergranular regions of NdCeFeB magnets with enhanced corrosion resistance

IF 5.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths Pub Date : 2025-01-25 DOI:10.1016/j.jre.2025.01.016

Xuegeng Wang , Bo Song , Xiaolian Liu , Shutai Zhou , Song Fu , Kai Xu , Xinxin Li , Junjie Ni

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引用次数: 0

Abstract

An idea hits us that in-situ synthesizing ceramic phase at intergranular regions of RE-Fe-B alloys should be beneficial to the performance of the materials against corrosion, and in this work a new nanoscale (Zr,Ti)B₂ with space and point groups of P6/mmm and Fmmm, respectively, was successfully synthesized in NdCeFeB sintered magnets. The hcp-structured (Zr,Ti)B₂ phases are present in a stripe-like shape. Some of (Zr,Ti)B₂ are developed at interfaces, and the others exist inside grain boundary phase. They co-exist with REFe₂ and RE-rich phases at intergranular regions. When proximity to RE₂Fe₁₄B grains, their orientation relationships obey

{[001]}_{{Nd}_{2} {Fe}_{14} B} ∥ {[1 \bar{1} 0]}_{{(Zr, Ti) B}_{2}}

. The formation of (Zr,Ti)B₂ generates significant local compressive stress, being 8.48 GPa, and plenty of reliefs are developed inside the RE₂Fe₁₄B grains. The in-situ formed (Zr,Ti)B₂ modifies the magnet microstructure, lessens the favorable sites for absorption reaction, narrows reaction channels, and reduces the potential difference between intergranular phase and main phase. Such favorable factors greatly enhance the corrosion resistance with an i_corr decrement by 70% in comparison to the unmodified magnet. These new discoveries are thought to be able to provide an insight into the method of potentially improving properties of magnets.

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在NdCeFeB磁体晶间区原位合成纳米级（Zr,Ti）B2，增强其耐蚀性

在RE-Fe-B合金晶间区原位合成陶瓷相有利于提高材料的抗腐蚀性能，本文成功地在NdCeFeB烧结磁体中合成了空间和点基分别为P6/mmm和Fmmm的新型纳米级（Zr,Ti）B2。hcp结构的（Zr,Ti）B2相呈条状存在。（Zr,Ti）B2部分在界面处发育，部分存在于晶界相内。它们与REFe2和富re相共存于晶间区。当靠近RE2Fe14B晶粒时，它们的取向关系服从[001]Nd2Fe14B∥[11¯0](Zr,Ti)B2。（Zr,Ti）B2的形成产生了显著的局部压应力，为8.48 GPa，并且在RE2Fe14B晶粒内部发育了大量的缓蚀。原位形成的（Zr,Ti）B2改变了磁体的微观结构，减少了有利于吸附反应的位置，缩小了反应通道，减小了晶间相与主相的电位差。这些有利因素大大提高了磁铁的耐腐蚀性，与未经改性的磁铁相比，其耐腐蚀性降低了70%。这些新发现被认为能够为潜在地改善磁体性能的方法提供见解。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.