ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Current processing methods for metal matrix composites (MMC) often producesagglomerated reinforced particles in the ductile matrix and also form unwanted brittle secondaryphases due to chemical reaction between matrix and the reinforcement. As a result they exhibitextremely low ductility. In addition to the low ductility, the current processing methods are noteconomical for producing engineering components. In this paper we demonstrate that theseproblems can be solved to a certain extent by a novel rheo-process. The key step in this process isapplication of sufficient shear stress on particulate clusters embedded in liquid metal to overcomethe average cohesive force of the clusters. Very high shear stress can be achieved by using thespecially designed twin-screw machine, developed at Brunel University, in which the liquidundergoes high shear stress and high intensity of turbulence. Experiments with Al alloys and SiCreinforcement reveal that, under high shear stress and turbulence conditions Al liquid penetratesinto the clusters and disperse the individual particle within the cluster, thus leading to a uniformmicrostructure
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.373.pdf
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