Mechanical properties of Mg alloys composites reinforced with short Saffil ® fibres

• Published in: Journal of alloys and compounds Vol. 378; no. 1; pp. 19 - 26
• Main Authors: Trojanová, Zuzanka, Gärtnerová, Viera, Lukáč, Pavel, Drozd, Zdeněk
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 22.09.2004; Elsevier
• Subjects: Applied sciences; Casting; Condensed matter: structure, mechanical and thermal properties; Deformation and plasticity (including yield, ductility, and superplasticity); Dislocations; Elasticity. Plasticity; Exact sciences and technology; Mechanical and acoustical properties of condensed matter; Mechanical properties; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Mechanical properties of solids; Metals; Metals. Metallurgy; Physics; Mechanical properties; Casting; Metals; Dislocations; Aluminium oxide; Thermal stress; Short fiber; Plastic flow; Fibre reinforced metal; Metal matrix composite; Compression test; Composite material; Dislocation density; Matrix fiber interface; Magnesium alloy; Shear stress; Squeeze casting; Flow stress
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2003.12.047

AZ91 and ZE41 matrix composites reinforced with short δ-alumina fibres (Saffil ®) were manufactured by the squeeze casting technology. The structure of composite materials consisted of short δ-alumina fibres (approximately 20 vol.%) distributed planar-randomly within the matrix. Compression tests on cylindrical composite samples were carried out at temperatures between 20 and 300 °C. Results obtained revealed that the flow stresses of the composites are substantially higher than those of unreinforced alloy at lower temperatures up to 200–250 °C, while at higher temperatures the influence of fibres is not significant. Different contributions to the strength of composites were evaluated. The shear stresses at the fibre–matrix interface were of the greatest importance in this regard, though the contributions resulting from the dislocation density increase. Thermal stresses are also significant.