Hongyang Li, Wenqi Xu, Hong Li, Zhenfeng Shen, Shentao Zeng, Feng Yang, Ran Wang, Cui Luo, Ying Liu
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Additionally, elevated annealing temperatures enhance the crystallinity of the alloy particles, causing particle aggregation and moderate growth. With the increase in Cu content, CoFe2O4 and CuFe2O4 phases are formed during annealing, resulting in a decrease in saturation magnetization intensity. Conversely, higher annealing temperatures promote crystallinity, thereby increasing saturation magnetization as well as residual magnetization and coercivity, exhibiting an initial rise followed by a decrease trend with increasing Cu element content. The real and imaginary components of the dielectric constant of Fe1Co0.8Ni1Cux alloy particles increase with Cu content, indicating improved dielectric loss capacity. However, the relationship between dielectric loss and Cu content is not linear, and post-heat treatment dielectric loss peaks are higher than in untreated samples. Multiple magnetic loss absorption peaks were observed in the imaginary component of permeability under different annealing conditions. Polarization relaxation is identified as the primary mechanism for dielectric loss, while eddy current loss dominates magnetic loss in some degree. The attenuation constant of heat-treated Fe1Co0.8Ni1Cux particles is higher than that of untreated particles, while the impedance matching value is lower. Under 600 °C annealing conditions, Fe1Co0.8Ni1Cu0.5 exhibits a minimum reflection loss (RLmin) of −40.26 dB, with a maximum absorption bandwidth of 4.72 GHz observed with coating thickness of 1.7 mm.</p><h3>Graphical Abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"31 7","pages":"2160 - 2174"},"PeriodicalIF":4.0000,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Alloy Element Adjustment and Heat Treatment Combination in Enhancing Electromagnetic Wave Absorption Properties of FeCoNiCu Medium Entropy Alloy\",\"authors\":\"Hongyang Li, Wenqi Xu, Hong Li, Zhenfeng Shen, Shentao Zeng, Feng Yang, Ran Wang, Cui Luo, Ying Liu\",\"doi\":\"10.1007/s12540-024-01867-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Fe1Co0.8Ni1Cu<sub>x</sub> quaternary medium-entropy magnetic alloy particles with varied Cu element contents were prepared with liquid-phase reduction. 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引用次数: 0
摘要
采用液相还原法制备了不同Cu元素含量的Fe1Co0.8Ni1Cux四元中熵磁性合金颗粒。通过SEM、VSM和矢量网络分析,结合热处理工艺,对这些颗粒的微观结构特征、静态磁性能和电磁波吸收行为进行表征。结果表明:合成的Fe1Co0.8Ni1Cux合金颗粒呈球状;随着Cu含量的增加,晶粒尺寸逐渐减小,平均粒径减小至10 ~ 40 nm。此外,升高的退火温度提高了合金颗粒的结晶度,导致颗粒聚集和适度生长。随着Cu含量的增加,退火过程中形成CoFe2O4和CuFe2O4相,导致饱和磁化强度降低。相反,较高的退火温度促进结晶度,从而提高饱和磁化强度、剩余磁化强度和矫顽力,随着Cu元素含量的增加,呈现先上升后下降的趋势。Fe1Co0.8Ni1Cux合金颗粒介电常数的实虚分量随Cu含量的增加而增大,表明其介电损耗能力有所提高。然而,介质损耗与Cu含量之间并不是线性关系,热处理后样品的介质损耗峰值高于未处理样品。在不同退火条件下,磁导率虚分量中存在多个磁损耗吸收峰。极化弛豫是介质损耗的主要机制,而涡流损耗在一定程度上主导磁损耗。热处理Fe1Co0.8Ni1Cux粒子的衰减常数高于未处理Fe1Co0.8Ni1Cux粒子,阻抗匹配值较低。在600℃退火条件下,Fe1Co0.8Ni1Cu0.5的最小反射损耗(RLmin)为- 40.26 dB,最大吸收带宽为4.72 GHz,涂层厚度为1.7 mm
Alloy Element Adjustment and Heat Treatment Combination in Enhancing Electromagnetic Wave Absorption Properties of FeCoNiCu Medium Entropy Alloy
Fe1Co0.8Ni1Cux quaternary medium-entropy magnetic alloy particles with varied Cu element contents were prepared with liquid-phase reduction. Characterization of the microstructural features, static magnetic properties, and electromagnetic wave absorption behavior of these particles was carried out through SEM, VSM, and vector network analysis combined with heat treatment processes. The results demonstrate that the synthesized Fe1Co0.8Ni1Cux alloy particles exhibit a spherical morphology. Increasing Cu content leads to a gradual reduction in particle size, with average particle diameters decreasing to the range of 10–40 nm. Additionally, elevated annealing temperatures enhance the crystallinity of the alloy particles, causing particle aggregation and moderate growth. With the increase in Cu content, CoFe2O4 and CuFe2O4 phases are formed during annealing, resulting in a decrease in saturation magnetization intensity. Conversely, higher annealing temperatures promote crystallinity, thereby increasing saturation magnetization as well as residual magnetization and coercivity, exhibiting an initial rise followed by a decrease trend with increasing Cu element content. The real and imaginary components of the dielectric constant of Fe1Co0.8Ni1Cux alloy particles increase with Cu content, indicating improved dielectric loss capacity. However, the relationship between dielectric loss and Cu content is not linear, and post-heat treatment dielectric loss peaks are higher than in untreated samples. Multiple magnetic loss absorption peaks were observed in the imaginary component of permeability under different annealing conditions. Polarization relaxation is identified as the primary mechanism for dielectric loss, while eddy current loss dominates magnetic loss in some degree. The attenuation constant of heat-treated Fe1Co0.8Ni1Cux particles is higher than that of untreated particles, while the impedance matching value is lower. Under 600 °C annealing conditions, Fe1Co0.8Ni1Cu0.5 exhibits a minimum reflection loss (RLmin) of −40.26 dB, with a maximum absorption bandwidth of 4.72 GHz observed with coating thickness of 1.7 mm.
期刊介绍:
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.