Mechanical alloying of Cu and Fe induced by severe plastic deformation of a Cu-Fe composite

Details Mechanical alloying of Cu and Fe induced by severe plastic deformation of a Cu-Fe composite Mechanical alloying of Cu and Fe induced by severe plastic deformation of a Cu-Fe composite

2006-06-28

arxiv.org/abs/cond-mat/0606723v1

Acta Materialia 53 (2005) 2127-2135

Physics

Condensed Matter

Materials Science

20 pages

Scientific paper

A filamentary composite elaborated by cold drawing was processed by High Pressure Torsion (HPT). The nanostructure resulting from this severe plastic deformation (SPD) was investigated thanks to scanning electron microscopy, transmission electron microscopy, X-ray diffraction and 3D atom probe. Although the mutual solubility of Cu and Fe is extremely low at room temperature in equilibrium conditions, it is shown that nanoscaled Fe clusters dissolve in the Cu matrix. The non-equilibrium copper supersaturated solid solutions contain up to 20at.% Fe. The driving force of the dissolution is attributed to capillary pressures and mechanisms which could enhanced the atomic mobility during HPT are discussed. We conclude that the interdiffusion is the result of a dramatic increase of the vacancy concentration during SPD.

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