J. Phys. Colloques
Volume 51, Numéro C1, Janvier 1990Proceeding of the International Congress
Intergranular and Interphase Boundaries in materials
|Page(s)||C1-311 - C1-316|
INTERACTION BETWEEN LATTICE DISLOCATIONS AND GRAIN BOUNDARIES IN FCC METALS AND ORDERED COMPOUNDSB.J. PESTMAN1, J. Th. M. DE HOSSON1, V. VITEK2 et F.W. SCHAPINK3
1 Department of Applied Physics, Materials Science Centre, University of Groningen, Nijenborgh 18, NL-9747 AG Groningen, The Netherlands
2 Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, U.S.A.
3 Department of Metallurgy, Technological University of Delft, Rotterdamseweg 137, NL-2628 AL Delft, The Netherlands
This paper describes a computer simulation study of the interaction between lattice dislocations and tilt grain boundaries. The calculations were carried out using a many-body potential for copper and potentials describing a stable Ll2 type of structure. Two interaction mechanisms were observed : absorption into the boundary by splitting into DSC dislocations and splitting into lattice Shockley partial dislocations, one of which was incorporated in the boundary. If the associated step height for the DSC's is small and (one of) the DSC's can glide in the boundary plane, the lattice dislocation dissociates into DSC dislocations in the boundary. Otherwise, another reaction is favourable, like the incorporation of one lattice partial dislocation in the boundary.