Homogeneous Cu-Fe super saturated solid solutions prepared by severe plastic deformation

Details Homogeneous Cu-Fe super saturated solid solutions prepared by severe plastic deformation Homogeneous Cu-Fe super saturated solid solutions prepared by severe plastic deformation

2010-06-17

arxiv.org/abs/1006.3433v1

Philosophical Magazine 90, 9 (2010) 1179-1195

Physics

Condensed Matter

Materials Science

Scientific paper

10.1080/14786430903313682

A Cu-Fe nanocomposite containing 50 nm thick iron filaments dispersed in a copper matrix was processed by torsion under high pressure at various strain rates and temperatures. The resulting nanostructures were characterized by transmission electron microscopy, atom probe tomography and M\"ossbauer spectrometry. It is shown that alpha-Fe filaments are dissolved during severe plastic deformation leading to the formation of a homogeneous supersaturated solid solution of about 12 at.% Fe in fcc Cu. The dissolution rate is proportional to the total plastic strain but is not very sensitive to the strain rate. Similar results were found for samples processed at liquid nitrogen temperature. APT data revealed asymmetric composition gradients resulting from the deformation induced intermixing. On the basis of these experimental data, the formation of the supersaturated solid solutions is discussed

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