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

• Published in: Journal of alloys and compounds 2014-08, Vol.605, p.164-167
• Main Authors: Pan, Shunkang, Liu, Xing, Cheng, Lichun, Wang, Xiaokun, Rao, Guanghui, Yao, Qingrong, Zhou, Huaiying
• Format: Article
• Language: English
• Subjects: Absorbing; Absorption; Chromium; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Differential thermal analysis; Erbium; Exact sciences and technology; Iron; Materials science; Microwave and radio-frequency interactions (excluding resonances); Microwaves; Noise levels; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other interactions of matter with particles and radiation; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Physics; Scanning electron microscopy; Ternary systems
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2014.03.180

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 ErFei sub(2-x)Cr sub(x) was determined to be x = 1.6-3.0. The maximum solid solubilities of Cr in ErFe sub(2), ErFe sub(3), Er sub(6)Fe sub(23), Er sub(2)Fei7, 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 ErFe sub(2), ErFe sub(3), Er sub(6)Fe sub(23), Er sub(2)Fe sub(17) and ErFe sub(10)Cr sub(2) 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.