An analysis of migration of low-angle dislocation boundaries with 3D discrete dislocation dynamics

0450285 - ÚFM 2016 RIV CZ eng A - Abstrakt
Záležák, Tomáš - Dlouhý, Antonín
An analysis of migration of low-angle dislocation boundaries with 3D discrete dislocation dynamics.
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. 43-43. ISBN 978-80-87434-07-9.
[ICSMA-17 International Conference on the Strength of Materials /17./. 09.08.2015-14.08.2015, Brno]
Grant CEP: GA ČR(CZ) GA14-22834S; GA ČR GJ15-21292Y; GA MŠMT(CZ) EE2.3.20.0214
Institucionální podpora: RVO:68081723
Klíčová slova: discrete dislocation dynamics * high temperature creep * critical shear stress * precipitate strenghtened materials * metal matrix composites
Kód oboru RIV: JI - Kompozitní materiály

A deformation behaviour of metal matrix composite (MMC) materials is nowadays in a particular focus of interest. These materials exhibit much higher creep resistance than ordinary alloys, and are thus important for many industrual products operating at high temperatures and loading. A recently developed 3D discrete dislocation dynamics(DDD) model has been employed to investigate MMCs. Recent calculations show that in precipitate hardened alloys there exists a critical applied shear stress, under which the deformation ceases. Furthermore, the DDD technique has been used to estimate stress exponents and stress-strain curves for MMC with rigid spherical precipitates. The results show that the stress exponents may reach considerable high values, even above 15 for higher dislocation densities.
Trvalý link: http://hdl.handle.net/11104/0251677