PRUSOV Evgeny Vladimir State University

Spoluautoři PANFILOV Alexey

In manufacturing of products from the aluminum matrix composite alloys (AMC’s) reinforced with dispersed particles, are inevitably formed sub-standard waste in the form of waste of castings, ingates, profits, the splashes, the fulfilled details, etc. Therefore in the general technical and economic balance of production and exploitation of AMC’s questions of a recycling of AMC’s or restoration of products from them for a reuse are important. One of solutions of this problem is remelting of sub-standard waste and the fulfilled details from AMC’s. To study of influence of AMC’c remelting on changing of their structure, morphology and distribution of reinforcing phases AMC’c of model compositions [Al + 5% Ti] and [Al + 5% Ti + 2,5% SiC] were chosen. The samples received before remelting, after one remelting and after two repeated remeltings are subjected to comparative researches. The analysis of results shows that repeated remeltings can promote redistribution of reinforcing particles in volume of composite alloy and reduce structural heterogeneity. At the same time, after the second remelting was a significant increase in average sizes of intermetallic phases and expansion of interphase zone at the interface “matrix - reinforcement” that testifies that interaction of SiC particles with matrix melt is revealed. Therefore at repeated remeltings (three and more) partial degradation of silicon carbide as a result of its interaction with aluminum is possible. In general, conducted researches show basic possibility of using of AMC’s after processing as a charge when producing new composites. It is possible to note that in most general case, AMC’s doesn’t allow more than two repeated remeltings, since the surface interaction at interfaces can lead to partial or complete degradation of silicon carbide.

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