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Nanostructure formation in mechanically alloyed Fe5Co95 revealed by X - ray diffraction and atomic force microscopy

I. PETEAN1,2, G. ARGHIR1, M. TOMOAIA-COTISEL2,* , O. HOROVITZ2, D. A. POP1

Affiliation

  1. Technical University of Cluj – Napoca, Faculty of Material Science and Engineering, 103 – 105 Muncii Ave., 400641 Cluj-Napoca, Romania
  2. Babes-Bolyai University of Cluj-Napoca, Faculty of Chemistry and Chemical Engineering, 11 Arany J. Str., 400028 Cluj – Napoca, Romania

Abstract

This work is focused on the formation of Fe5Co95 nanostructure by mechanical alloying. Elemental Fe and Co powder mixture, weight dosed to Fe5Co95, was used. This mixture was milled in a planetary ball mill for 1, 2, 4, 8, and 12 hours and samples for analysis were taken out at each milling time. The powder mixture samples were investigated by X – ray diffraction (i.e., full width at half maximum of diffraction peaks: FWHM) and atomic force microscopy (AFM) tapping mode. Grain size obtained by Williamson–Hall technique matches with values obtained by AFM. Three stages for the nanostructure formation of Fe5Co95 mechanically alloyed solid solution were found. In the first stage, after 1 hour of milling, powder particles form a two phase micro scale composite having about 100 nm grain size. After 2 hours of milling, the second stage begins and is characterized by crack initiation due to cold hardening. In this stage a solid solution is formed and grain size decreases to reach the nanoscale level of about 60 nm. After 4 hours of milling a solid solution is formed with grain size of about 40 nm. Further, the third stage (after 8 hours up to 12 hours of milling) leads to the complete formation of nanostructure with grain size of around 20 nm..

Keywords

Fe-Co, mechanical alloying, nanostructure, X – ray diffraction (FWHM), AFM.

Submitted at: Sept. 3, 2010
Accepted at: Oct. 14, 2010

Citation

I. PETEAN, G. ARGHIR, M. TOMOAIA-COTISEL, O. HOROVITZ, D. A. POP, Nanostructure formation in mechanically alloyed Fe5Co95 revealed by X - ray diffraction and atomic force microscopy, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 10, pp. 2119-2125 (2010)