Influence of particles on work hardening strain and recovery strain

0450352 - ÚFM 2016 RIV CZ eng A - Abstract
Blum, W. - Dvořák, Jiří - Král, Petr - Sklenička, Václav
Influence of particles on work hardening strain and recovery strain.
Book of Abstracts. 17th International Conference on the Strength of Materials (ICSMA-17). Brno: Ústav fyziky materiálů AV ČR, v. v. i., 2015 - (Dlouhý, A.; Kunz, L.). s. 137-137. ISBN 978-80-87434-07-9.
[ICSMA-17 International Conference on the Strength of Materials /17./. 09.08.2015-14.08.2015, Brno]
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0068
Institutional support: RVO:68081723
Keywords : recovery strain * CuZr particles * crystallite boundaries * work hardening
Subject RIV: JG - Metallurgy

Inelastic deformation of crystalline materials leads to accumulation of defects causing work hardening. Defect recovery is also associated with generation of inelastic strain. Jump like stress reductions are a means to separate work-hardening strain from recovery strain. A considerable contribution to recovery strain comes from recovery of boundaries of low-and high-angle type. The question is, how particles of foreign phase influence the kinetics of the two strain contributions, in particular the recovery strain. It is shown for particle hardened Cu-Zr that particles increase the strength by raising the resistance to straining of the work hardening type. We show that the recovery strain is significantly suppressed by particles. The resultant particle strengthening effect therefore results not only from interaction of gliding dislocations with particles, but is dependent on the effect of the particles on the recovery strain, in particular the recovery strain component resulting from crystallite boundaries. This opens new perspectives for understanding particle hardening under all conditions where mechanically and thermally activated recovery of defects plays a role.
Permanent Link: http://hdl.handle.net/11104/0251718