Article (Scientific journals)
Influence of Fibre Distribution and Grain Size on the Mechanical Behaviour of Friction Stir Processed Mg-C Composites
Mertens, Anne; Simar, Aude; Adrien, Jérôme et al.
2015In Materials Characterization, 107, p. 125
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Keywords :
Mg alloys; Friction stir processing; Metal matrix composites; Mechanical properties; Microstructures; LiMaRC - Liège Materials Research Center
Abstract :
[en] Short C fibres-Mg matrix composites have been produced by friction stir processing sandwiches made of a layer of C fabric stacked between two sheets of Mg alloy AZ31B or AZ91D. This novel processing technique can allow the easy production of large-scale metal matrix composites. The paper investigates the microstructure of FSPed C fibre-Mg composites in relation with the fragmentation of the C fibres during FSP and their influence on the tensile properties. 3D X-ray tomography reveals that the fibres orient like onion rings and are more or less fragmented depending on the local shear stress during the process. The fibre volume fraction can be increased from 2.3% to 7.1% by reducing the nugget volume, i.e. by using a higher advancing speed in AZ31B alloy or a stronger matrix alloy, like AZ91D alloy. A higher fibre volume fraction leads to a smaller grain size which brings about an increase of the composite yield strength by 15 to 25%. However, a higher fibre volume fraction also leads to a lower fracture strain. Fracture surface observations reveal that damage occurs by fibre/matrix decohesion along fibres oriented perpendicularly to the loading direction.
Disciplines :
Materials science & engineering
Author, co-author :
Mertens, Anne  ;  Université de Liège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Simar, Aude;  Université Catholique de Louvain - UCL > Institute of Mechanics, Materials and Civil Engineering > IMAP
Adrien, Jérôme;  Institut National des Sciences Appliquées de Lyon > MATEIS Laboratory
Maire, Eric;  Institut National des Sciences Appliquées de Lyon > MATEIS Laboratory
Montrieux, Henri-Michel ;  Université de Liège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Delannay, Francis;  Université Catholique de Louvain - UCL > Institute of Mechanics, Materials and Civil Engineering > IMAP
Lecomte-Beckers, Jacqueline ;  Université de Liège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Language :
English
Title :
Influence of Fibre Distribution and Grain Size on the Mechanical Behaviour of Friction Stir Processed Mg-C Composites
Publication date :
2015
Journal title :
Materials Characterization
ISSN :
1044-5803
Publisher :
Elsevier Science, New York, United States - New York
Volume :
107
Pages :
125
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 July 2015

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