Glass forming ability and magnetic properties of Fe–B–Si–EM (EM = Ti, Zr, Mo, and Hf) alloys with high iron content

• Published in: Journal of materials science. Materials in electronics 2017-07, Vol.28 (14), p.10218-10223
• Main Authors: Li, Wen, Yang, Y. Z., Yao, C. L., Xie, Z. W., Xie, C. X.
• Format: Article
• Language: English
• Subjects: Alloys; Annealing; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coercivity; Crystallization; Diffraction patterns; Ferrous alloys; Glass formation; Magnetic properties; Magnetic saturation; Magnetism; Materials Science; Melt spinning; Molybdenum base alloys; Optical and Electronic Materials; Optimization; Precipitates; Quenching; Ribbons; Tapes (metallic); Thermal stability; Titanium
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-017-6788-7

A series of high iron content Fe – B – Si – EM (EM = Early transition metal) amorphous/nanocrystalline alloy ribbons were fabricated by melt spinning. The effects of EM on glass forming ability, thermal stability and magnetic properties of Fe 84 B 8 Si 5 EM 3 alloys were investigated. Based on XRD patterns of the melt-spun ribbons, a completely amorphous structure forms in Fe 84 B 8 Si 5 Mo 3 alloy, and partial α-Fe phase precipitates in the (200) crystal plane in Fe 84 B 8 Si 5 Ti 3, Fe 84 B 8 Si 5 Zr 3 and Fe 84 B 8 Si 5 Hf 3 alloys. These alloys show excellent thermal stability, especially for Fe 84 B 8 Si 5 Mo 3 and Fe 84 B 8 Si 5 Hf 3 alloys; the temperature interval between the first and the second onset crystallization temperature (∆T x  = T x2 −T x1 ) can reach 298 °C. Compared with the other alloys, the Fe 84 B 8 Si 5 Mo 3 alloy exhibits higher saturation magnetization M s of approximately 152.8 emu/g and lower coercivity H c of about 11.3 A/m, thereby showing excellent magnetic properties in the as-quenched state. When annealed at the temperature close to the first crystalline peak temperature (T p1 ) for 0.5 h, a clear diffraction pattern consisting of three peaks appears; this pattern is identified as bcc α-Fe phase. Proper annealing treatment can optimize the magnetic properties. The optimal annealing temperature range is found to be 550–650 °C.