4.7 Article

Influences of extrusion parameters on microstructure and mechanical properties of particulate reinforced magnesium matrix composites

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.04.064

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Extrusion; Magnesium matrix composites; Stir casting; Particle distribution

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SiCp/AZ91 composites fabricated by stir casting were extruded at different extrusion temperatures and ratios. Extrusion reduced the necklace-type particle distribution and improved particle distribution of the composites. As extrusion temperatures and ratios increased, particle distribution was improved, and the grain sizes of matrix increased. The mechanical properties of the composites were improved with the increase of extrusion temperatures and ratios. The microstructure evolution of matrix was not the main influential factor of the mechanical properties of the composites. The particle evolution, which included particle redistribution and particle cracking induced by extrusion, significantly affected the mechanical properties of the extruded composites. (C) 2011 Elsevier B.V. All rights reserved.

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