Synthesis and characterisation of nanostructured FeCo alloys

• Published in: Journal of materials science Vol. 39; no. 16-17; pp. 5441 - 5443
• Main Authors: MOUMENI, H, ALLEG, S, DJEBBARI, C, BENTAYEB, F. Z, GRENECHE, J. M
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Heidelberg Springer 01-08-2004; Springer Nature B.V
• Subjects: Allotropic transformation; Alloying elements; Applied sciences; Ball milling; Ball mills; Clusters, nanoparticles, and nanocrystalline materials; Cobalt; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Diffraction patterns; Exact sciences and technology; Ferrous alloys; Grain size; Iron; Iron 57; Materials science; Materials synthesis; materials processing; Mechanical alloying; Metals. Metallurgy; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals; Physics; Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation; Rietveld method; Solid solutions; Structure of solids and liquids; crystallography; X-ray diffraction; Metal powder; Crushing; Moessbauer spectroscopy; Iron alloys; XRD; Nanostructures; Mechanical alloying; Ultrafine powder; Fabrication; Chemical composition; Nanocrystal; Iron base alloys; Planetary mill; Ball mill; Iron 57; Phase transformations; Experimental study; Cobalt base alloys; Binary alloys; Solid state reaction; Fabrication structure relation; Microstructure; Cobalt alloys; Mechanochemistry; Transition element alloys
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/B:JMSC.0000039262.37788.b7

Nanocrystalline Fe(1−x)Cox (x = 0.12, 0.5, 0.6) mixtures have been prepared by mechanical alloying using a planetary ball mill under several milling conditions. The alloying process between the elemental powders and the microstructure changes of the prepared samples have been investigated using X-ray diffraction (XRD) and 57Fe Mössbauer spectrometry.The XRD patterns refinement on the mechanical alloying products according to the Rietveld method (Maud software) reveals the allotropic transformation of Co from fcc to hcp form and the progressive dissolution of Co into the α-Fe lattice as a function of both Co concentration and milling conditions. The grain size values of the obtained powders reaches a nanometer scale of about 10 nm.Mössbauer results show that the beginning of the solid state reaction between Fe and Co elemental powders depends on the milling conditions. After 24 h of milling, the average hyperfine magnetic fields values of Fe88Co12, Fe50Co50 and Fe40Co60 mixtures are consistent with a disordered and an ordered FeCo solid solution, respectively.