Regensburg 2010 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 37: Mechanical Properties II
MM 37.5: Vortrag
Mittwoch, 24. März 2010, 15:45–16:00, H16
Recrystallisation of single-phase Copper alloys investigated by resistance measurements — •Alexander Kauffmann1,2, Jens Freudenberger1, Hansjörg Klauß1, Tom Marr1,2, Konstantin Nenkov1, Vadlamani Subramanya Sarma3, Jürgen Eckert1,2, and Ludwig Schultz1,2 — 1IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — 2TU Dresden, Institute of Materials Science, 01062 Dresden, Germany — 3Dept. Metallurgical and Materials Engineering, IIT Madras, Chennai 600036, India
Copper based solid solutions with different contents of solute elements (Zn, Al, Ga, Sn, Ge) were deformed at room-temperature and at liquid Nitrogen temperature. The recrystallisation behaviour of these alloys has been investigated by means of dynamic and isothermal measurements of the resistivity (ρ). Variations of (dρ/dT) from (ρ0 α) are interpreted in terms of changes in defect densities by recovery and recrystallisation. Deviations from a linear temperature depedence of the resistivity increase with increasing solute concentration and depend on the stacking fault energy (γ). We observe a (1/γ2)-dependency of the deviations which are also influenced by the deformation temperature. During deformation, γ controls the possibility to store deformation energy in the form of dislocations and deformation twins. In combination with the general trend of alloying elements to shift recrystallisation to higher temperatures, the recrystallisation behaviour of single-phase copper alloys has been described qualitatively. The observed stored dislocation and twin densities interfere with solution hardening to the macroscopic strength after deformation.