Název:
Influence of Heterogeneity of Microstructure on Creep Behaviour of SPD Metals
Autoři:
Král, Petr ; Dvořák, Jiří ; Kvapilová, Marie ; Svoboda, Milan ; Sklenička, Václav Typ dokumentu: Příspěvky z konference Konference/Akce: NANOCON 2012. International Conference /4./, Brno (CZ), 2012-10-23 / 2012-10-25
Rok:
2012
Jazyk:
eng
Abstrakt: The methods of severe plastic deformation enable a production of bulk metals with the submicrometer or even nanometer grain size. Experiments were conducted to determine an effect of equal-channel angular pressing (ECAP) on the creep behavior of pure metal. The ECAP deformation was performed at room temperature by route Bc. Constant load creep tests in tension were conducted at 373 K under different stresses. The values of the stress exponent n of the minimum creep rate for ultrafine-grained material were determined. Microstructure of samples was characterized by scanning electron microscope equipped with the electron backscatter diffraction unit. Heterogeneity of microstructure was evaluated by coefficient of variation CVa. It was found that the fracture behavior in UFG materials is influenced by GBS, formation of mesoscopic shear bands and cavitation.
Klíčová slova:
creep behaviour; nanoindentation; Ultrafine-grained microstructure Číslo projektu: CEZ:AV0Z20410507 (CEP), GPP108/10/P469 (CEP) Poskytovatel projektu: GA ČR Zdrojový dokument: NANOCON 2012 - Conference Proceedings, ISBN 978-80-87294-32-1
Instituce: Ústav fyziky materiálů AV ČR
(web)
Informace o dostupnosti dokumentu:
Dokument je dostupný v příslušném ústavu Akademie věd ČR. Původní záznam: http://hdl.handle.net/11104/0215266