Investigation on the formation of Cu-Fe nano crystalline super-saturated solid solution developed by mechanical alloying
Author
Mojtahedi, M.
Goodarzi, M.
Aboutalebi, M.R.
Ghaffari, M.
Soleimanian V.
Date
2013Source Title
Journal of Alloys and Compounds
Print ISSN
0925-8388
Volume
550
Pages
380 - 388
Language
English
Type
ArticleItem 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
HAADFHRTEM
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/11693/21074Published Version (Please cite this version)
http://dx.doi.org/10.1016/j.jallcom.2012.http://dx.doi.org/10.112Collections
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