Investigation of the structural and microwave dielectric properties of mechanically alloyed Fe40Co60 powders

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Otmane, F.^1 ; Bergheul, S.^1 ; Triaa, S.^2 ; Azzaz, M.^2

Laboratoire des Sciences Aéronautiques, Université de Blida, BP 270 Route de Soumaa, Blida, Algeria^1

Laboratoire de Science et Génie des Matériaux, USTHB, BP 32, Bab-Ezzouar, Algeria^2

关键词: Body centered cubic lattices;    Conductive behavior;    Dielectric permittivities;    Gaussian profiles;    High surface area;    Mechanically alloyed;    Microwave dielectric properties;    Residual strains;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012028/pdf
DOI  :  10.1088/1757-899X/63/1/012028

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Fe40Co60 powders were produced by mechanical Alloying (MA) route. Structural and microwave dielectric properties were investigated. Discussion of obtained results is conducted according to milling time. X-Ray powder Diffraction (XRD) shows that disordered α (Fe40Co60) solid solution of substitution with body centered cubic (bcc) lattice is formed after 2h milling. Halder Wagner analysis reveals that least grain size of 15.59 nm and residual strain up to 0.8% are reached after 60h milling. The evolution of the Voigtian mixing factors according to milling progression confirms that structural properties are governed by residual strain accumulated during high- energy mechanical alloying (Gaussian profiles). Scanning Electron Microscopy (SEM) indicates that obtained powders adopt flattened angular shapes with high surface area. Microwave measurements are undertaken on bulk samples. High values of the dielectric permittivity depicting the conductive behavior of Fe-Co powders are measured. Dielectric permittivity spectra according to milling time shift towards higher values. Enhancement of the dielectric properties is related to the developed structure after milling.