Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 495, Issue 1, Pages 59-62Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.02.034
Keywords
Mechanical alloying; Solid solution; Nano-crystalline; X-ray diffraction
Categories
Funding
- Iran Nanotechnology Initiative Council
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In this paper, elemental Cu-7 wt.% Cr powder mixture was mechanically alloyed in order to study the solid solubility extension during the alloying process. By mechanical alloying in a high energy ball mill, a nano-structured and homogeneous Cu-Cr powder was obtained. The effect of toluene as a process control agent (PCA) was investigated. The structural changes were characterised by X-ray diffraction (XRD) technique. The Gibbs free energy change in this system during the formation of solid solution was calculated and shown to be positive, which means that a thermodynamic barrier exist for the formation of this alloy system in solid state. It was found that the additional energy stored in the nano-crystalline Cu-Cr alloy during mechanical alloying process as a result of crystallite size reduction and increased dislocation density, would be high enough to overcome the thermodynamic barrier in the formation of a solid solution. (C) 2010 Elsevier B.V. All rights reserved.
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