Different creep behaviour and microstructure of ECAP aluminium with the identical ECAP history

0349529 - ÚFM 2011 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Král, Petr - Dvořák, Jiří - Sklenička, Václav - Svoboda, Milan
Different creep behaviour and microstructure of ECAP aluminium with the identical ECAP history.
METAL 2010. Conference proceedings. Ostrava: Tanger, s.r.o, 2010, Čl. PE10. ISBN 978-80-87294-15-4.
[Metal 2010. International Conference on Metallurgy and Materials /19./. Rožnov pod Radhoštěm (CZ), 18.05.2010-20.05.2010]
Grant CEP: GA ČR GPP108/10/P469
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: orientation image microscopy * creep * ultrafine - grained microstructure
Kód oboru RIV: JJ - Ostatní materiály

Experiments were conducted on extremely coarse - grained Al (99.99%. The subsequent extrusion passes were performed by route A (no rotation between subsequent passes) up to 2 ECAP passes. Creep tests in tension were performed on the as-pressed samples at 473 K and applied stress 15 MPa. It was found that the ultrafine - grained Al specimens with the same ECAP history showed the scatter in the creep properties. In this work the microstructure changes within grains with different crystallographic orientations and near their high - angle boundaries of coarse-grained state in the sample after different ECAP passes were studied. Mutual comparison of the results of microstructural characterization of microstructure of as-received coarse-grained state and the state after different ECAP passes were performed. It is concluded that the scatter in creep properties could be influenced by inhomogeneity of ECAP microstructure.
Trvalý link: http://hdl.handle.net/11104/0189741