Solidification of composite suspension during flowing in mould
Zbigniew Konopka, Małgorzata Cisowska-Łągiewka, Andrzej Zyska Politechnika Częstochowska, Katedra Odlewnictwa, al. Armii Krajowej 19, 42-200 Częstochowa
Quarterly No. 4, 2005 pages 100-103
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abstract The results of castability experiments of the AlMg10 alloy matrix composites with graphite, SiC and mixture of these particles were presented in this paper. During castability test the temperature of flowing metal was measured. The Ni-NiCr thermoelements were placed into cavity of sand spiral test mould. The temperature of composite suspension was registered out by means of computer measuring card PCL 818. The castability results and pictures of spiral test castings were presented (Fig. 1). On the ground of the temperature curves for each place of mould (Figs 2-4) the function of length spiral and instantaneous flow velocity were determined (Figs 5-7). In Figure 8 the temperature of metal stream front was presented. Using the solid phase fraction as a linear function of temperature the change of volume solid phase fraction during composites flow was calculated and presented in Figure 9. Different kinetics of flow and solidification of examined composites were observed. Average velocity and flow distance (castability) for composite with 10% vol. graphite particles are higher than for composite with SiC particles. Flow is finished at about 70% solid phase fraction in AlMg10-graphite composites and at only 45% solid phase fraction in composites with SiC particles. Key words: aluminium, composites, solidification, castability