Creep processes in magnesium metal matrix composites

0450623 - ÚFM 2016 RIV CZ eng A - Abstract
Sklenička, Václav - Kuchařová, Květa - Svoboda, M. - Kvapilová, Marie - Lukáč, P.
Creep processes in magnesium metal matrix composites.
Book of Abstracts. 17th International Conference on the Strength of Materials (ICSMA-17). Brno: Ústav fyziky materiálů AV ČR, v. v. i., 2015 - (Dlouhý, A.; Kunz, L.). s. 216-216. ISBN 978-80-87434-07-9.
[ICSMA-17 International Conference on the Strength of Materials /17./. 09.08.2015-14.08.2015, Brno]
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0068
Institutional support: RVO:68081723
Keywords : magnesium composites * magnesium alloys * creep * reinforcement * interfacial microstructure * load transfer
Subject RIV: JG - Metallurgy

This paper reviews the creep characteristics of the two magnesium monolithic alloys and their various discontinuous composites. It was found that both of the short-fibre reinforced AZ91 and QE22 composites exhibit better creep resistance than their monolithic alloys due to an effective load transfer in which part of the external load within the matrix is transferred to the reinforcement. Indirect composite strengthening may be caused by microstructural effects leading to a threshold stress increases the creep resistance. However, indirect reinforcement effect can also produce weakening as it was found in the case of particle-reinforced QE22+SiC composite due to enhanced precipitation of Nd-rich phases at the SiC/matrix interfaces. Comparison between AZ91 and QE22 magnesium hybrid composites reinforced with short carbon fibre and SiC particulates has shown, that the creep resistance of the hybrid reinforced AZ91 alloy was considerably improved by comparison with the unreinforced matrix alloy. By contrast, no beneficial effect on the creep resistance of the hybrid reinforced QE22 alloy was found.
Permanent Link: http://hdl.handle.net/11104/0251925