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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2012

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The effect of α-alumina particles on the properties of EN AC-44200 Al alloy based composite materials

Kaczmar J. W., Kurzawa A.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 55, nr 1

39--44

Purpose: The unreinforced EN AC-44200 aluminium alloy is characterized by the medium mechanical properties and the purpose of performed investigations was improvement of mechanical properties of this alloy by introducing stable ceramic α-alumina particles. Design/methodology/approach: The composite materials were manufactured by squeeze casting of porous ceramic preforms characterized by the open porosities of 90%, 80%, 70% and 60% with the liquid EN AC-44200 aluminum alloy. The composite materials containing 10 vol. %, 20 vol. %, 30 vol. % and 40 vol. % were manufactured and characterized by the homogeneous distribution of alumina particles in the matrix. On the base of microscopic investigations there was ascertained good bonding at the interface matrix/ strengthening particles. Findings: Manufacturing of porous ceramic preforms from alumina powders characterized by the desired open porosity was elaborated. After squeeze casting with liquid EN AC-44200 alloy there was noticed considerable increase of physical and mechanical properties: hardness HB increased from 82 HB for unreinforced alloy to 150 HB for material containing 40 vol. % of particles. There was noticed increase of tensile strength, bending strength and compression strength, although what is typical for composite materials, decrease of impact strength. Research limitations/implications: There was noticed small rest porosity with decreasing porosity of the ceramic preforms. Further investigations on porosity removal basing on modification of production parameters are forseen. Practical implications: Reinforcing of EN AC-44200 aluminum alloy with ceramic particles is effective taking into account increase of hardness and strength (tensile, bending, compression), although the relatively low impact strength can be restriction for the applications of these materials as the elements subjected to dynamic loads. Originality/value: Manufactured materials can be applied as elements subjected to static loads and the relatively large specific strength allow to diminish the weight of elements applied in the construction of means of transportation.