An Evaluation of Creep Mechanisms in Ultrafine-Grained Metals

0359645 - ÚFM 2012 RIV CH eng J - Článek v odborném periodiku
Kvapilová, Marie - Sklenička, Václav - Dvořák, Jiří - Král, Petr
An Evaluation of Creep Mechanisms in Ultrafine-Grained Metals.
Key Engineering Materials. Roč. 465, - (2011), s. 382-385. ISSN 1013-9826.
[MSMF /6./ Materials Structure and Micromechanics of Fracture. Brno, 28.06.2010-30.06.2010]
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: creep * equal-chanel angular pressing * ultrafine-grained microstructure
Kód oboru RIV: JJ - Ostatní materiály

Our earlier published creep data are analyzed for ultrafine-grained pure aluminium and copper processed by equal-channel angular pressing (ECAP). The analysis demonstrates conclusively that creep occurs in the investigated materials after ECAP by the same mechanism as in conventional coarse-grained materials with intergranular dislocation glide and climb as the dominant ratecontrolling flow process. Under creep conditions examined in this work diffusion creep is not important in pure aluminium and copper because the ultrafine grains are unstable at elevated and/or high temperature creep and the grains grow sufficiently to preclude any significant contribution from Nabarro-Herring or Coble creep
Trvalý link: http://hdl.handle.net/11104/0197390