Spinodal decomposition and precipitation in Cu-Cr nanocomposite. Sheibani, S., Heshmati-Manesh, S., Ataie, A., Caballero, A., & Criado, J. M. Journal of Alloys and Compounds, 587:670–676, February, 2014. WOS:000329114100104doi abstract bibtex In this study, spinodal decomposition and precipitation mechanism of mechanically alloyed supersaturated Cu-3wt.%Cr and Cu-5wt.%Cr solid solutions was investigated under nonisothermal aging. Decomposition mechanism and kinetics were studied using differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques. Also, the microstructure was characterized by transmission electron microscopy (TEM). Effect of Al2O3 reinforcement on the aging kinetics was also evaluated. It was found that Cu-3wt.%Cr and Cu-5wt.%Cr solid solutions undergo spinodal decomposition at initial stages of ageing. However, decomposition mechanism was changed to nucleation and growth by the aging progress. The aging kinetics for the Cu-Cr/Al2O3 composition appeared to be slightly faster than that for Cu-Cr, since the ageing activation energy is decreased in presence of Al2O3 nano-particles. This behavior is probably due to the higher dislocation density and other structural defects previously produced during ball milling. A detailed comparison of the DSC results with those obtained by TEM, showing good consistency, has been presented. The average size of Cr-rich precipitates was about 10 nm in the copper matrix. (C) 2013 Elsevier B. V. All rights reserved.
@article{sheibani_spinodal_2014,
title = {Spinodal decomposition and precipitation in {Cu}-{Cr} nanocomposite},
volume = {587},
issn = {0925-8388},
doi = {10.1016/j.jallcom.2013.11.019},
abstract = {In this study, spinodal decomposition and precipitation mechanism of mechanically alloyed supersaturated Cu-3wt.\%Cr and Cu-5wt.\%Cr solid solutions was investigated under nonisothermal aging. Decomposition mechanism and kinetics were studied using differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques. Also, the microstructure was characterized by transmission electron microscopy (TEM). Effect of Al2O3 reinforcement on the aging kinetics was also evaluated. It was found that Cu-3wt.\%Cr and Cu-5wt.\%Cr solid solutions undergo spinodal decomposition at initial stages of ageing. However, decomposition mechanism was changed to nucleation and growth by the aging progress. The aging kinetics for the Cu-Cr/Al2O3 composition appeared to be slightly faster than that for Cu-Cr, since the ageing activation energy is decreased in presence of Al2O3 nano-particles. This behavior is probably due to the higher dislocation density and other structural defects previously produced during ball milling. A detailed comparison of the DSC results with those obtained by TEM, showing good consistency, has been presented. The average size of Cr-rich precipitates was about 10 nm in the copper matrix. (C) 2013 Elsevier B. V. All rights reserved.},
language = {English},
journal = {Journal of Alloys and Compounds},
author = {Sheibani, S. and Heshmati-Manesh, S. and Ataie, A. and Caballero, A. and Criado, J. M.},
month = feb,
year = {2014},
note = {WOS:000329114100104},
keywords = {Copper, Mechanical alloying, Spinodal decomposition, co alloys, contact materials, equilibria, kinetics, liquid-phase separation, nanocomposite, solid-solutions, solidification, system, thermodynamics, vacuum},
pages = {670--676},
}
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It was found that Cu-3wt.%Cr and Cu-5wt.%Cr solid solutions undergo spinodal decomposition at initial stages of ageing. However, decomposition mechanism was changed to nucleation and growth by the aging progress. The aging kinetics for the Cu-Cr/Al2O3 composition appeared to be slightly faster than that for Cu-Cr, since the ageing activation energy is decreased in presence of Al2O3 nano-particles. This behavior is probably due to the higher dislocation density and other structural defects previously produced during ball milling. A detailed comparison of the DSC results with those obtained by TEM, showing good consistency, has been presented. The average size of Cr-rich precipitates was about 10 nm in the copper matrix. (C) 2013 Elsevier B. V. 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Decomposition mechanism and kinetics were studied using differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques. Also, the microstructure was characterized by transmission electron microscopy (TEM). Effect of Al2O3 reinforcement on the aging kinetics was also evaluated. It was found that Cu-3wt.\\%Cr and Cu-5wt.\\%Cr solid solutions undergo spinodal decomposition at initial stages of ageing. However, decomposition mechanism was changed to nucleation and growth by the aging progress. The aging kinetics for the Cu-Cr/Al2O3 composition appeared to be slightly faster than that for Cu-Cr, since the ageing activation energy is decreased in presence of Al2O3 nano-particles. This behavior is probably due to the higher dislocation density and other structural defects previously produced during ball milling. A detailed comparison of the DSC results with those obtained by TEM, showing good consistency, has been presented. 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