Effect of amorphous evolution on structure and absorption properties of FeSiCr alloy powders

• Published in: Journal of magnetism and magnetic materials Vol. 335; pp. 17 - 20
• Main Authors: Zou, B.F., Zhou, T.D., Hu, J.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.06.2013; Elsevier
• Subjects: Absorption; Absorption property; Amorphous; Amorphous semiconductors, metals, and alloys; Amorphous structure; Chromium; Coercive force; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Disordered solids; Domain effects, magnetization curves, and hysteresis; Electromagnetic waves; Exact sciences and technology; FeSiCr alloy; Frequency ranges; Magnetic properties and materials; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Master alloys; Microwave and radio-frequency interactions (excluding resonances); Milling; 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; Physics; Structure of solids and liquids; crystallography; Absorption property; Amorphous; FeSiCr alloy; Milling; Grain size; Particle size; Ball mill; Crystallization; Amorphous alloy; Microwave absorption; Wide band; Coercive force; Vacuum induction furnace; Complex permittivity; Amorphous state structure; Saturation magnetization; Iron base alloys; Transition element alloys
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2013.01.011

The master alloys of Fe87.5−xSi13.5Crx (x=0, 4, 8, 12at%) were prepared in vacuum induction melting furnace. Corresponding powder samples were obtained by 60h ball milling of the crushed master alloys, and studied by morphological, microstructural, electromagnetic and microwave absorption tests in the frequency range from 0.5 to 18GHz. The powders were characterized by a particle size less than 1μm and a grain size less than 100nm. In the cases of x≥8, Fe3Si phase with D03-type structure was observed, and the powders became amorphous completely. A crystallization temperature of 685K was found for x=8. Coercivity force and saturation magnetization of the powders decreased with the increasing of Cr content. As an electromagnetic wave absorbing material, the minimum reflectivity was −15.5dB at 8.5GHz and the absorption band was broad for x=8 powders. ► When Cr is 8at%, after 60h milling, D03 superlattice appeared. And exothermic peak appears at 685K. ► With increasing Cr content, Ms decreases from 145 to 99emu/g; μ″ is larger than the others at low frequency. ► The minimum reflectivity is −15.5dB at 8.5GHz for Cr content is 8at% when thickness is 2mm. ► The amorphous Fe78.5Si13.5Cr8 alloy can be applied as electromagnetic wave absorber.