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A dislocation density based material model to simulate the anisotropic creep behavior of single-phase and two-phase single crystals

: Preußner, J.; Rudnik, Y.; Brehm, H.; Völkl, R.; Glatzel, U.


International Journal of Plasticity 25 (2009), No.5, pp.973-994
ISSN: 0749-6419
Journal Article
Fraunhofer IFAM ()

The primary and secondary creep behavior of single crystals is observed by a material model using evolution equations for dislocation densities on individual slip systems. An interaction matrix defines the mutual influence of dislocation densities on different glide systems. Face-centered cubic (fcc), body-centered cubic (bcc) and hexagonal closed packed (hcp) lattice structures have been investigated. The material model is implemented in a finite element method to analyze the orientation dependent creep behavior of two-phase single crystals. Three finite element models are introduced to simulate creep of a gamma' strengthened nickel base superalloy in < 100 >, < 110 > and < 111 > directions. This approach allows to examine the influence of crystal slip and cuboidal microstructure on the deformation process.