Atomistic simulations of dislocation-precipitate interactions emphasize importance of cross-slip

作者：Singh C V; Mateos A J; Warner D H^*

来源：Scripta Materialia, 2011, 64(5): 398-401.

DOI：10.1016/j.scriptamat.2010.10.041

• Aluminium alloys
• Molecular dynamics
• Precipitation hardening
• Dislocation-obstacle interaction
• Cross-slip

This work examines the interaction of screw dislocations with Guinier-Preston (GP) zones using atomistic simulations. Both Orowan looping and cross-slip mechanisms are found to control the interactions. Cross-slip, occurring both at zero and finite temperatures, is found to either significantly reduce or enhance precipitate strengthening, depending upon the orientation of the dislocation-GP zone interaction. The orientation dependence, and its dependence on temperature, provides a micromechanical explanation for the experiments of Muraishi et al. (Philos. Mag. A 82 (2002) 2755).

• 出版日期2011-3