CYCLIC PLASTIC BEHAVIOR AND FATGIUE LIFE OF AZ91 ALLOY IN AS-CAST AND ULTRAFINE-GRAINED STATE

0434751 - ÚFM 2015 RIV SK eng J - Článek v odborném periodiku
Fintová, Stanislava - Kunz, Ludvík
CYCLIC PLASTIC BEHAVIOR AND FATGIUE LIFE OF AZ91 ALLOY IN AS-CAST AND ULTRAFINE-GRAINED STATE.
Materiálové inžinierstvo - Materials Engineering. Roč. 21, č. 3 (2014), s. 109-115. ISSN 1335-0803
Grant CEP: GA MŠMT(CZ) 7AMB14SK064
Institucionální podpora: RVO:68081723
Klíčová slova: AZ91 * ECAP * Bimodal structure * Fatigue * Plastic deformation * Crack initiation
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

Fatigue properties of magnesium alloy AZ91 in as-cast and in ultrafine-grained state prepared by equal channel angular pressing were investigated. The fatigue strength in the low-cycle fatigue region was found to be substantially improved by the severe plastic deformation, whereas the improvement in the high-cycle fatigue region is negligible. The cyclic plastic response in both states is qualitatively similar; short initial softening is followed by a long cyclic hardening. The observed fatigue behavior was discussed in terms of specific microstructural features of both states and on the basis of cyclic slip localization and fatigue crack initiation.
Trvalý link: http://hdl.handle.net/11104/0238768