کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1619322 | 1005719 | 2010 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Structural investigation on nano-crystalline Cu–Cr supersaturated solid solution prepared by mechanical alloying Structural investigation on nano-crystalline Cu–Cr supersaturated solid solution prepared by mechanical alloying](/preview/png/1619322.png)
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.
Journal: Journal of Alloys and Compounds - Volume 495, Issue 1, 9 April 2010, Pages 59–62