Microstructure and mechanical properties of ultrafine-grained magnesium AZ91 alloy

0434590 - ÚFM 2015 RIV CH eng C - Conference Paper (international conference)
Fintová, Stanislava - Pantělejev, L. - Kunz, Ludvík
Microstructure and mechanical properties of ultrafine-grained magnesium AZ91 alloy.
Metallography XV. Zurich: Trans Tech Publications, 2014 - (Longauerová, M.; Zubko, P.), s. 384-389. Materials Science Forum, 782. ISBN 978-3-03835-072-9. ISSN 0255-5476.
[Metallography2013 - International Symposium on Metalography /15./. Stará Lesná (SK), 24.04.2013-26.04.2013]
R&D Projects: GA ČR GAP108/10/2001
Institutional support: RVO:68081723
Keywords : AZ91 * Cyclic plastic deformation * ECAP * Fatigue crack initiation * Mechanical properties * Microstructure
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Microstructure, mechanical properties, cyclic plastic deformation behavior and fatigue strength of ultrafine-grained (UFG) magnesium alloy AZ91 processed by equal channel angular pressing (ECAP) were investigated. ECAP of originally cast alloy results in development of bimodal structure, improved yield stress, tensile strength and ductility when compared to the as-cast state. Endurance limit based on 107 cycles is also improved, however exhibits large scatter. Initiation of fatigue cracks takes place in regions of large grains in the bimodal structure, where the content of Mg17Al12 particles is low.
Permanent Link: http://hdl.handle.net/11104/0238641