Effect of different number of ECAP passes on creep in Cu-Zr alloy

0349522 - ÚFM 2011 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Král, Petr - Dvořák, Jiří - Svoboda, Milan - Kvapilová, Marie - Sklenička, Václav
Effect of different number of ECAP passes on creep in Cu-Zr alloy.
Metal 2010. 19th International conference on metallurgy and materials - Conference Proceedings. Ostrava: Tanger s.r.o., 2010, s. 736-740. ISBN 978-80-87294-17-8.
[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: ultrafine-grained microstructure * creep * equal-channel angular pressing
Kód oboru RIV: JJ - Ostatní materiály

A coarse-grained binary Cu-0.2wt%Zr alloy was processed by equal-channel angular pressing (ECAP) in order to evaluate the effect of severe plastic deformation on the thermal stability of resulting ultrafine-grained microstructure after ECAP and on creep behaviour of the pressed alloy. Constant stress creep tests in tension were conducted at temperature 673 K and at the different applied stresses. It was found that the Cu-0.2Zr alloy after the first four ECAP passes exhibited higher creep resistance by comparison with unpressed state. However, the alloy processed by 8 ECAP passes showed faster creep rate than unpressed material under the same loading conditions. The measured value of stress exponent of the creep rate n~6 indicates possibility of an intragranular deformation mechanism as the rate-controlling process in creep of an alloy after 8 ECAP passes. Furthermore, creep behaviour of ECAPed material may be influenced by mesoscopic boundary sliding along shear bands.
Trvalý link: http://hdl.handle.net/11104/0189736