Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 54: Computational Materials Modelling VIII - Mechanical Properties and Strain

MM 54.2: Vortrag

Donnerstag, 29. März 2012, 16:00–16:15, TC 006

How do residual stresses influence the mechanical properties of severly plastically deformed metal composites? — •Tom Marr¹, Jens Freudenberger², Alexander Kauffmann^1,2, Hansjörg Klauß², and Ludwig Schultz² — ¹TU Dresden, Dresden, Germany — ²IFW Dresden, Dresden, Germany

Severe plastic deformation at room temperature or at temperatures below the recrystallization temperature of various materials is often used to enhance their mechanical properties. By applying these techniques, work hardening is achieved which goes along with a strong grain refinement, texture sharpening and changes in grain boundary characteristics. Residual stresses in these materials are another factor that might contribute to the effective mechanical properties. Surprisingly few works are dealing with this issue despite the fact that especially in composite materials residual stresses are likely to be observed when severe deformation is applied.

In this work, CP titanium, an Al alloy 5049 as well as a composite material made from both materials are cold deformed to logarithmic deformation strains of η = 4. Tensile tests are carried out on each of them, while finite element calculations are used to simulate the deformation regime of the composite. Finally, a suggestion is given on how residual stresses can act as a contribution to mechanical properties of severely plastically deformed materials on top of cold work, grain refinement, texture development and grain boundary characteristics changes.