Phase equilibria at 773 K and microwave absorbing properties of Er-Fe-Cr alloys

作者：Pan, Shunkang; Liu, Xing; Cheng, Lichun; Wang, Xiaokun; Rao, Guanghui^*; Yao, Qingrong; Zhou, Huaiying

来源：Journal of Alloys and Compounds, 2014, 605: 164-167.

DOI：10.1016/j.jallcom.2014.03.180

• Phase equilibria
• Phase diagram
• Er-Fe-Cr system
• Microwave absorbing properties

The phase equilibria of Er-Fe-Cr system at 773 K were investigated by X-ray powder diffraction (XRD), differential thermal analysis (DTA), and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). The isothermal section consists of 8 single-phase regions, 14 two-phase regions and 7 three-phase regions. The homogeneity range of the ternary compound ErFe12 Cr-x(x) was determined to be x = 1.6-3.0. The maximum solid solubilities of Cr in ErFe2, ErFe3, Er6Fe23, Er2Fe17, and Fe are about 8.2, 1.2, 15.6, 9.6 and 13.8 at.% Cr, respectively, and the solubility limit of Fe in Cr is about 13.3 at.% Fe. The microwave absorbing properties of the intermetallic compounds in Er-Fe-Cr system were determined. All the samples exhibited good absorbing property in the X-band (8-12 GHz). With a coating thickness of d = 2.0 mm, the minimum return loss at the absorption peak frequency of the ErFe2, ErFe3, Er6Fe23, Er2Fe17 and ErFe10Cr2 are -19.66 dB at 9.6 GHz, -29.57 dB at 8.16 GHz, -35.04 dB at 12.72 GHz, -22.72 dB at 9.76 GHz and -13.51 dB at 11.2 GHz, respectively.

• 出版日期2014-8-25
• 单位桂林电子科技大学