材料科学
微观结构
高熵合金
矫顽力
合金
腐蚀
剩磁
铁磁性
透射电子显微镜
扫描电子显微镜
冶金
密度泛函理论
磁性
相(物质)
复合材料
磁化
凝聚态物理
纳米技术
磁场
化学
物理
有机化学
量子力学
计算化学
作者
Zhaohui Wu,Bin Li,Mengya Chen,Yong Yang,Ruiyi Zheng,Yuan Lu,Zhong Li,Xiaohua Tan,Hui Xu
标识
DOI:10.1016/j.jallcom.2022.163665
摘要
The FeCoNiCuAl high-entropy alloy (HEA) has good magnetic and –mechanical properties which can be finely tuned by the fraction, composition, and distribution of the BCC and FCC phases. In this paper, we report the magnetic properties, corrosion resistance, and microstructure of the FeCoNiCuAlCex (0 ≤ x ≤ 0.09) HEAs. The results show that Ce addition is beneficial to the remanence (Br), coercivity (Hc), and hysteresis losses (Pu), but detrimental to the maximum permeability (μm) and maximum flux density (Bm). When x = 0.09, the Br, Hc, and Pu of the HEAs are improved by about 91%, 64% and 91%, respectively. The FeCoNiCuAl HEA has good corrosion resistance, comparable to 304 stainless steels. The addition of Ce improved the Icorr of the HEAs. X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) results show that the FeCoNiCuAl HEAs are composed of a face-centered cubic (FCC) phase and a body-centered cubic (BCC) phase, with the Cu-rich nano-precipitates embedded in the BCC phase. With the addition of Ce, the nano-precipitates become even smaller and more uniform. Meanwhile, the FCC phase becomes Cu-rich and its magnetism changes from ferromagnetic to non-ferromagnetic. The electronic density of state (DOS) for the alloys calculated by density functional theory (DFT) is discussed.
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