Elastic and Plastic Behavior of the QE22 Magnesium Alloy Reinforced with Short Saffil Fibers and SiC Particles

0493634 - ÚFM 2019 RIV CH eng J - Journal Article
Zapletal, J. - Trojanová, Z. - Doležal, P. - Fintová, Stanislava - Knapek, M.
Elastic and Plastic Behavior of the QE22 Magnesium Alloy Reinforced with Short Saffil Fibers and SiC Particles.
Metals. Roč. 8, č. 2 (2018), č. článku 133. E-ISSN 2075-4701
R&D Projects: GA MŠMT(CZ) LQ1601; GA MŠMT LM2015069
Institutional support: RVO:68081723
Keywords : metal-matrix composites * shear-lag model * hybrid composites * mechanical-properties * deformation mechanisms * hardening behavior * thermal-expansion * tensile behavior * casting process * creep-behavior * magnesium-alloy-based composite * Halpin-Tsai-Kardos model * deformation behavior * composite strengthening * fracture behavior
OECD category: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Impact factor: 2.259, year: 2018

Magnesium alloy QE22 (nominal composition 2 wt % Ag, 2 wt % mixture of rare earth elements, balance Mg) was reinforced with 5 vol % Saffil fibers and 15 vol % SiC particles. The hybrid composite was prepared via the squeeze cast technique. The microstructure of the monolithic alloy and composite was analyzed using scanning electron microscopy. Elastic modulus was measured at room temperature and modeled by the Halpin-Tsai-Kardos mathematical model. The strengthening effect of fibers and particles was calculated and compared with the experimentally obtained values. The main strengthening terms were determined. Fracture surfaces were studied via scanning electron microscope. While the fracture of the matrix alloy had a mainly intercrystalline character, the failure of the hybrid composite was transcrystalline.
Permanent Link: http://hdl.handle.net/11104/0288007