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MM: Metall- und Materialphysik

MM 34: Symposium Materials Modelling III

MM 34.6: Vortrag

Donnerstag, 30. März 2006, 18:15–18:30, IFW A

A refined statistical strain hardening and recovery model — •Volker Mohles, Prasad Gurla, and Günter Gottstein — Institut für Metallkunde und Metallphysik, RWTH Aachen, Kopernikusstr. 14, D-52056 Aachen, Germany

Statistical models of dislocation density evolution are a means to quickly predict flow stress curves of metal alloys. They involve a relatively large number of parameters to be adjusted, but they can be utilized for instance in Finite Element simulations of plastic deformation for their low calculation effort. One such model actually applied for this purpose is the 3-Internal-Variables-Model 3IVM. This model has been improved recently in several aspects, especially so in respect of recovery kinetics: climb and cross slip are both allowed for, and an additional recovery mechanism has been added which is proportional to the strain rate. With this recovery model, 3IVM can now be fitted quite well to flow curves of Al-polycrystals (almost pure) at various strain rates and temperatures T in the range 20^∘C < T < 450^∘C with a single set of parameters. In addition, for improved coverage of alloys, the strengthening effect of solutes has been revised such that thermally activated dislocation glide is regarded accurately.