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      Investigation on the formation of Cu-Fe nano crystalline super-saturated solid solution developed by mechanical alloying

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      Author
      Mojtahedi, M.
      Goodarzi, M.
      Aboutalebi, M.R.
      Ghaffari, M.
      Soleimanian V.
      Date
      2013
      Source Title
      Journal of Alloys and Compounds
      Print ISSN
      0925-8388
      Volume
      550
      Pages
      380 - 388
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      In this study, the formation of super saturated solid solution in the binary Cu-Fe system was investigated. Three powder blends with 30, 50 and 70 wt.% of Fe were milled for different times to 96 h. The variations of lattice parameter and inter-planar spacing were calculated and analyzed using X-ray diffraction analysis (XDA). The anisotropy of lattice deformation in the FCC phase was studied and the obtained results were compared to milled pure Cu powder. Furthermore, crystallite size was calculated using Scherer formula in comparison with Rietveld full profile refinement method. Considering the previous studies about the formation of non-equilibrium FCC and BCC phases, the phase evolution has been discussed and the proportion of each phase was calculated using Rietveld refinement method. Supplementary studies on the evolution of microstructure and formation of solid solution were carried out using high resolution transmission electron microscopy (HRTEM). Finally, high angle annular dark field (HAADF) imaging was utilized to find out the level of homogeneity in the resulting phases. While true alloying takes place in each phase, the final structure consists of both FCC and BCC nano-crystallites. © 2012 Elsevier B.V. All rights reserved.
      Keywords
      HAADF
      HRTEM
      Mechanical alloying
      Rietveld refinement
      Solid solubility extension
      XDA
      Bcc phasis
      Cu powders
      FCC phase
      HAADF
      High-angle annular dark fields
      HRTEM
      Interplanar spacings
      Lattice deformation
      Nanocrystallines
      Non equilibrium
      Phase evolutions
      Powder blends
      Refinement methods
      Rietveld
      Rietveld refinement method
      Solid solubility extension
      Supersaturated solid solutions
      XDA
      Crystal structure
      High resolution transmission electron microscopy
      Mechanical alloying
      Microstructural evolution
      Solid solutions
      X ray diffraction analysis
      Rietveld refinement
      Permalink
      http://hdl.handle.net/11693/21074
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.jallcom.2012.http://dx.doi.org/10.112
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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