Mechanical characteristics of Al‐CaCO3/Zn composites

No Thumbnail Available
Akpan, E.I.
Abhuliem, I. U.
Adeosun, S.O.
Gbenebor, O.P.
Journal Title
Journal ISSN
Volume Title
Annals of Faculty Engineering Hunedoara – International Journal of Engineering
Effect of CaCO3 particle (100μm) addition on the mechanical properties of aluminium‐0.5% Si alloy has been investigated. Samples are produced using conventional stir casting method and homogenized at 5500C for four hours. Mechanical properties studied are tensile strength, tensile elongation, hardness and fracture strength. Cast samples containing 25wt%CaCO3 and 5wt%Zn exhibit the highest tensile strength (134.3MPa) owing to a breakdown of grain structure caused by the dissolution of CaAl2 and AlFeSi into the α‐aluminium matrix. Samples containing 5wt%CaCO3and 5wt%Zn have superior hardness (131.1MPa) due to high volume fraction of precipitates in the microstructure. The microstructure shows the presence of AlFeSi, Mg2Si and CaAl2intermetallics in the α‐ aluminium matrix. Keywords: CaCO3 particles, composites, precipitates, Intermetallics.
Staff publications
Composites , Intermetallics , Mechanical properties , Conventional stir casting method , Research Subject Categories::TECHNOLOGY
Akpan E.I.,Abhuliem, I.U.,Adeosun, S.O., Gbenebor O.P. (2014). Mechanical characteristics of Al‐CaCO3/Zn composites, ANNALS of Faculty Engineering Hunedoara – International Journal of Engineering, 9: 251-258