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Professor Henryk Paul


Instability of plastic flow and their role in texture transformations in fcc metals



The purpose of this seminar is to provide a ‘minimum’ knowledge base in the field of deformation and recrystallization to PhD students coming from diverse backgrounds.
This seminar briefly recalls the basic descriptions, definitions and fundamental relations between flow stress and strain (constitutive laws) used to describe plastic deformation. These relations depend closely on the microscopic mechanisms of plastic flow in crystalline materials (single and polycrystals) and their work hardening at low homologous temperatures. The analysis of some important features of plastic deformation that are important for large strains, such as macroscopic hardening, anisotropy, plastic instability and failure are of special interest.
The energy stored after deformation influence the ‘temperature stability’ of the as-deformed structures. Given its importance for thermo-mechanical processing provides an overview of some important events including: stored energy of deformation, surface energy and the movement of high-angle boundaries. The softening processes, i.e. recovery, recrystallization and grain growth and associated microstructural changes will be defined based on driving force and the mechanisms involved.



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