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Correlation between microstructure and soft magnetic parameters of Fe-Co-Ni-Al medium-entropy alloys with FCC phase and BCC phase
Intermetallics ( IF 4.4 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.intermet.2020.106898
Xiaohua Tan , Yajie Tang , Yunfeng Tan , Qin Deng , Huisheng Jiao , Yang Yang , Hui Xu

Abstract The magnetic property and microstructure of as-cast FeCoNiAlx (x = 0.2, 0.4, 0.6, 0.8, 1.0) MEAs prepared by copper mold suction were investigated. For x ≤ 0.6 alloys, the soft magnetic properties monotonously decrease with increasing Al content, while a turning point of improving magnetic property occurs at x = 0.8. XRD result shows that Al addition changes the phase constitution. The alloys (x ≤ 0.4) consist of single FCC phase. FeCoNiAl0.6 (x = 0.6) and FeCoNiAl0.8 (x = 0.8) alloys are composed of FCC phase and BCC phase. FeCoNiAl1.0 (x = 1.0) alloy consists of single BCC phase. Furthermore, more serious lattice distortion is present in FCC phase than that in BCC phase. It results in the deterioration of soft magnetic property by increasing the coercivity (Hc) and the hysteresis loss (Pu), and decreasing the initial permeability (μi) and the maximum permeability (μm). The grain-boundary character distribution of FeCoNiAl0.6 (x = 0.6) alloy and FeCoNiAl0.8 (x = 0.8) alloy was studied by electron backscatter diffraction (EBSD). Less strain concentration is observed in x = 0.8 alloy than that in x = 0.6 alloy because of containing much smaller number of low angle boundaries (LAB) with a misorientation angle between 2° and 5° (5.71%) than 36.6% in x = 0.6 alloy. It leads to an improvement of soft magnetic property by decreasing the Hc, the Pu, and increasing the μi and the μm of x = 0.8 alloy. Energy dispersive spectroscopy (EDS) result shows that, in both FeCoNiAl0.6 (x = 0.6) and FeCoNiAl0.8 (x = 0.8) alloys, the enrichment of Fe and Co elements and the depletion of Ni and Al elements are observed in FCC phase, while Fe and Co elements are depleted and Ni and Al elements are enriched in BCC phase. Moreover, a close value of ferromagnetic elements, (Fe + Co + Ni)%, is obtained in FCC phase (≈85%) and BCC phase (≈78%) in both FeCoNiAl0.6 (x = 0.6) and FeCoNiAl0.8 (x = 0.8) alloys. Combined with results of EDS and magnetic properties of x = 0.6 and x = 0.8 alloys, it can conclude that the saturation magnetization (Ms) of BCC phase is larger than that of FCC phase.

中文翻译:

FCC相和BCC相Fe-Co-Ni-Al中熵合金组织与软磁参数的相关性

摘要 研究了铜模抽吸法制备的铸态FeCoNiAlx (x = 0.2, 0.4, 0.6, 0.8, 1.0) MEA的磁性能和显微组织。对于 x ≤ 0.6 合金,软磁性能随着 Al 含量的增加而单调下降,而磁性能提高的转折点出现在 x = 0.8 处。XRD 结果表明添加Al 改变了相组成。合金 (x ≤ 0.4) 由单一 FCC 相组成。FeCoNiAl0.6 (x = 0.6) 和 FeCoNiAl0.8 (x = 0.8) 合金由 FCC 相和 BCC 相组成。FeCoNiAl1.0 (x = 1.0) 合金由单一 BCC 相组成。此外,FCC 相比 BCC 相存在更严重的晶格畸变。它通过增加矫顽力(Hc)和磁滞损耗(Pu)导致软磁性能变差,并降低初始渗透率 (μi) 和最大渗透率 (μm)。通过电子背散射衍射(EBSD)研究了FeCoNiAl0.6 (x = 0.6)合金和FeCoNiAl0.8 (x = 0.8)合金的晶界特征分布。在 x = 0.8 合金中观察到的应变浓度比在 x = 0.6 合金中观察到的应变浓度低,因为它包含的低角度边界 (LAB) 的数量比 x = 中的 36.6% (5.71%) 少得多,且取向差角介于 2° 和 5° 之间0.6 合金。通过降低 x = 0.8 合金的 Hc、Pu 和增加 μi 和 μm,可以改善软磁性能。能量色散谱 (EDS) 结果表明,在 FeCoNiAl0.6 (x = 0.6) 和 FeCoNiAl0.8 (x = 0.8) 合金中,在 FCC 中观察到 Fe 和 Co 元素的富集以及 Ni 和 Al 元素的消耗阶段,BCC 相中 Fe 和 Co 元素贫乏,Ni 和 Al 元素富集。此外,在 FeCoNiAl0.6 (x = 0.6) 和 FeCoNiAl0.8 的 FCC 相 (≈85%) 和 BCC 相 (≈78%) 中获得了接近的铁磁元素值 (Fe + Co + Ni)% (x = 0.8) 合金。结合x=0.6和x=0.8合金的EDS和磁性能结果,可以得出BCC相的饱和磁化强度(Ms)大于FCC相的饱和磁化强度(Ms)。
更新日期:2020-11-01
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