Calcined aluminium dross as cost-effective particulate reinforcement in aluminium-based composites
Kevorkijan, Varužan
In this work, the potential of finely powdered aluminium dross by-product (▫$d_50=67\mu$▫) as a cost effective reinforcement in discontinuously reinforced aluminium matrix composites (A356) was ...investigated on the basis of quality-cost modeling. Using a standard rheocasting procedure, samples of composite material were obtained consisting of 20 vol. % of as received and three in-laboratory processed grades of dross particles which differed mainly in practicle size and level of impurities. Inspection of the tensile properties of these different composite materials showed that a slight improvement in strength over the unreinfoced matrix is achievable only by the introduction of fine dross particles with an average particle size less than 10 mm. In composites with larger dross particles the strengthening effect was not observed. In contrast, evaluation of the wear properties demonstrated that the introduction of coarse and even as-received dross particles in an aluminium matrix results in a significant improvement in the wear resistance of the composite material. However, in that case there is a sacrifice in strength. Quality-cost modeling of these two grades of dross reinforced Al-based composites indicates that both may be applicable for some less critical engineered and wear resistant components, with possible wide-spred application in the transporation industry.
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