Abstract
Fabrication and microstructure of the AlSi11 matrix composite containing 10 % volume fraction of CrFe30C8 particles were presented in this paper. Composite suspension was manufactured by using mechanical stirring. During stirring process the temperature of liquid metal, time of mixing and rotational speed of mixer were fixed. After stirring process composite suspension was gravity cast into shell mould. The composites were cast, applying simultaneously an electromagnetic field. The aim of the present study was to determine the effect of changes in the frequency of the current power inductor on the morphology of the reinforcing phase in the aluminum matrix. The concept is based on the assumption that a chromium-iron matrix of CrFe30C8 particles dissolves and residual carbide phases will substantially strengthen the composite. The microstructure and interface structure of the AlSi11/CrFe30C8 composite has been studied by optical microscopy, scanning microscopy and X-ray diffraction.
Highlights
During the last two decades a lot of research has focused on aluminum metal matrix composites (Al MMCs)
Depending on the maximum theoretical speed of movement of metal in the mould V 1,2; 1,8; 2,4 [m/s] obtained for frequency ƒ 50, 75, 100 [Hz] adequately surface transition reinforcing phase had a different form in AlSi11/CrFe30C8 composite castings, what is shown in the Figure 5
With an increased rotation speed caused by an increase in current frequency supplying the inductor to 75 [Hz], a growth of transition phase precipitates in the entire analyzed surface was observed
Summary
During the last two decades a lot of research has focused on aluminum metal matrix composites (Al MMCs). A wide variety of fabrication techniques has been explored for Al MMCs, which include vapour state methods, liquid phase methods (infiltration of preforms, rheocasting/thixoforming, melt stirring and squeeze casting) and solid state methods (powder forming and diffusion bonding) [2][4]. The preponderance of research studies on Al MMCs has been aimed at developing particle reinforced aluminum matrix composites (PR-AlMCs), based on liquid methods, because they can be used to produce components by casting processes. The fabrication of PR-AlMCs using casting techniques is attractive because it permits a low-cost and net-shape fabrication, adaptability of casting processes to existing production practices and flexibility in designing the structure through controlled solidification. The volume fraction and the size of the reinforcements that can be added are very limited [1,2,3,4,5,6,7,8]
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