X-Ray Diffraction, Microstructure and Mössbauer Studies of Nanostructured Fe₉₀Mg₁₀ Powders Elaborated by Mechanical Alloying

Abstract:

The mechanical alloying (MA) of elemental powder mixtures of Fe₉₀Mg₁₀ (atomic ratio of 79.67:20.33) was performed in an argon atmosphere using a planetary ball mill process. The alloy formation and the different physical properties were investigated as a function of milling time, t (in the 0–54h range) by means of the X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), and Mössbauer spectroscopy (MS). The formation of the solid solution α-Fe (Mg) started after 4 h of milling. The Mg peaks are completely missing. XRD results also indicated that when the milling time increases, the lattice parameter increases, whereas the grain size decreases and the mean level of microstrains increase. The powder particle morphology was observed by SEM at different stages of milling. The Mössbauer spectra were fitted with two sextets corresponding to the crystalline body centered cubic (bcc) Fe phase and a second sextet which represents supersaturated solid solutions of Mg in (α-Fe). The appearance and the increase in intensity of the second sextet 17, 66 % at (12 h) to 50 % (54 h) with t corresponding to the dissolved Mg in the (α-Fe). This may indicate that the interfacial region effect increases with milling time due to the grain size reduction and to the disordered state of the interfacial region.

• Periodical: Journal of Nano Research (Volume 38)
• Pages: 114-123
• DOI: https://doi.org/10.4028/www.scientific.net/JNanoR.38.114
• Online since: January 2016
• Authors: Abdennour El Mohri, Abderrahim Guittoum, K. Taibi, M. Azzaz
• Keywords: Iron-Magnesium, Mechanical Alloying, Mössbauer Spectroscopy, X-Ray Diffraction, α-Fe (Mg)

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