Dislocation slip distance during compression of Al–Si–Cu–Mg alloy with additions of Ti–Zr–V

Abstract

The plastic deformation behaviour of the Al–Si–Cu–Mg alloy with micro-additions of Zr–V–Ti was measured in the temperature range of 298–673 K and the true stress–true strain compression curves were used to calculate the dislocation slip distance (DSD). A new constitutive equation for the temperature dependent DSD was developed, based on Mott’s theory of strain hardening. The DSD predicted by the model was in good agreement not only with values achieved for the Al–Si–Cu–Mg alloy tested but also for other Al based and Pb–Sb alloys with deformation data available in the literature. A comparison of deformation and microstructure suggests that the grain refinement during hot compression deformation occurring due to continuous dynamic recrystallisation is responsible for a drastic growth of the DSD.

Keywords:

• Aluminium alloys
• Dislocation slip distance
• Strain hardening
• Plastic deformation

Acknowledgements

The authors would like to acknowledge the financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC) and Advanced Materials for Transportation Program of Natural Resources Canada. D. L. Chen is grateful for the financial support by NSERC-DAS Award, Premier’s Research Excellence Award, Canada Foundation for Innovation, and Ryerson Research Chair program. The authors also thank Q. Li, A. Machin, J. Amankrah, and R. Churaman for their assistance in the experiments, Professor S. Bhole for helpful discussion and P. Newcombe, H. Webster and D. Saleh from CanmetMATERIALS for casting the alloy.