Effect of V on microstructure and properties of Fe1.25CoNiAlMn0.21Vx magnetic high-entropy alloys

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-09-04 DOI:10.1016/j.matchar.2024.114330

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Abstract

The mechanism of performance enhancement of magnetic high-entropy alloys (MHEAs) under powder metallurgical processes is unknown, especially in terms of precipitated phases. This work reports the doping behavior of Fe_1.25CoNiAlMn_0.21V_x (x = 0, 0.2 and 0.5) MHEAs, caused by the change of V content. Fe_1.25CoNiAlMn_0.21V_x MHEAs were prepared by the mechanical alloying (MA) and the spark plasma sintering (SPS). Special attention was paid to the effect of the V content on the microstructure evolution, hardness, compressive strength, and magnetic properties of HEAs. Interestingly, the phase structure of these alloys remained relatively stable regardless of the variation in V content. The addition of a small amount of V helps to increase the saturation magnetization Ms of the alloy up to 117.2 emu/g and also promotes the solid-solution strengthening effect, with a maximum compression strength of 2724 MPa and a hardness of 531 HV. The excess V atoms could not completely enter the FCC phase to form a solid solution, but would instead and form a tough and brittle phase, reducing the mechanical properties of the alloy.

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V 对 Fe1.25CoNiAlMn0.21Vx 磁性高熵合金微观结构和性能的影响

磁性高熵合金（MHEAs）在粉末冶金工艺下的性能提升机制尚不清楚，尤其是在析出相方面。本研究报告了由 V 含量变化引起的 Fe1.25CoNiAlMn0.21Vx（x = 0、0.2 和 0.5）MHEAs 的掺杂行为。通过机械合金化（MA）和火花等离子烧结（SPS）制备了 Fe1.25CoNiAlMn0.21Vx MHEAs。研究人员特别关注了钒含量对 HEAs 的微观结构演变、硬度、抗压强度和磁性能的影响。有趣的是，无论钒含量如何变化，这些合金的相结构都保持相对稳定。少量 V 的添加有助于将合金的饱和磁化 Ms 提高到 117.2 emu/g，同时还能促进固溶强化效应，使合金的最大压缩强度达到 2724 MPa，硬度达到 531 HV。过量的 V 原子无法完全进入 FCC 相形成固溶体，反而会形成韧脆相，降低合金的机械性能。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.