Effective models for predicting strength of severely plastically deformed metals and alloys

Starink, Marco (2017) Effective models for predicting strength of severely plastically deformed metals and alloys. In, Edelati, Kaveh, Ikoma, Yoshifumi and Horita, Zenji (eds.) Promoting advanced energy materials by SPD and phase transformation: Proceedings of the International Workshop on Giant Straining Process for Advanced Materials (GSAM2017). International Workshop on Giant Straining Process for Advanced Materials (GSAM2-17) (02/09/17 - 05/09/17) Fukuoka, Japan. pp. 66-69.

Abstract

In this work, selected models for dislocation generation during severe plastic deformation (SPD) of pure metals and metallic alloys, and the resulting grain refinement and strengthening of the materials are reviewed. The models are based on volume-averaged dislocation generation, and show a good correlation with measured grain refinement and strengthening in pure metals and metallic alloys. It is shown that dislocation annihilation during the SPD processing is a key factor determining the relative response of pure metals to SPD. In metals with relatively low activation energy for self-diffusion during the (dynamic) recovery, like Al, Mg and Zn, most dislocations generated during SPD are immediately annihilated, resulting in limited grain refinement (or even grain coarsening) and low strengthening. In alloyed metals, both dissolved atoms and second phase particles enhance dislocation generation and grain refinement. In most cases the refined grains and dislocations dominate the strengthening, but also short range ordering (SRO) in the form of dislocation-solute complexes cause strengthening.

This record has no associated files available for download.

Contributors

Download statistics