Fachbereich 11 - Physik
Institut für Materialphysik
Strengthening and Nanostructure of Metals and Alloys

Computer simulations of particle strengthening

The planar glide of dislocations - perfect or dissociated ones - in particle strengthened materials is simulated in computers. In contrast to most other investigations in this field realistic three dimensional particle arrays are studied and the flexibility of dislocations is modelled on the basis of Brown's concept of the dislocation's self-interaction, i. e. the dislocation line tension approach is not followed. Hence even the glide in peak- and overaged materials can be simulated correctly.

Drittmittelgeber:

Deutsche Forschungsgemeinschaft

Beteiligte Wissenschaftler:

Dr. B. Fruhstorfer, Dr. V. Mohles, Prof. a. D. Dr. E. Nembach (Leiter), Z. Rong

Veröffentlichungen:

Mohles, V.: Superposition of dispersion strengthening and size-mismatch strengthening: computer simulations, Phil. Mag. Let. 83 (2003), 9

Mohles, V.: The critical resolved shear stress of single crystals with long-range ordered precipitates calculated by dislocation dynamics simulations, Mat. Sci. Eng. A. (2003), in press

Mohles, V., B. Fruhstorfer: Computer simulations of Orowan process controlled dislocation glide in particle arrangements of various randomness, Acta Mater., 50, 2503, 2002

Osetski, O. N., D. J. Bacon, V. Mohles: Atomic modelling of strengthening mechanisms due to voids and copper precipitates in a-iron, Phil. Mag. A (2003), in press