Interface Characterization of Hybrid Composite Extrusions

Abstract:

Through the development of new metal matrix composites, the specific strength and stiffness can be increased above the level of conventional light metal alloys and increase their potential for lightweight applications. The composite extrusion process is a promising manufacturing method for reinforced light metal extrusions. Particularly, the reinforcement with ceramic fibers can increase both the specific strength and stiffness which are essential for lightweight purposes. To exploit the full potential of the reinforcement, the interface of this MMC has to be optimized regarding the load transfer between matrix and fiber and therefore has to offer a strong bonding. In this contribution a hybrid composite is produced by using an Al₂O₃-fiber/AlMg0.2 composite wire which is embedded in an EN AW-6082 extrusion profile. Both the characterization of the interface and determination of the influence of processing and heat treatment are presented. For that purpose, the composites are characterized qualitatively by metallographic analysis and quantitatively by micro push-out testing of the ceramic fibers prior and after composite extrusion. To investigate the influence of additional heat treatment the state as fabricated, which equals a T4 state of the matrix material, as well as a T6 state with additional solution annealing and artificial ageing are compared. It was found that the extrusion process has a beneficial influence on the microstructure and the mechanical interface properties and therefore confirms applicability of composite extrusion for manufacturing of alumina reinforced profiles. The heat treatment however showed no significant influence on the embedded composite wire and its interface properties.

• Periodical: Materials Science Forum (Volumes 825-826)
• Pages: 134-141
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.825-826.134
• Online since: July 2015
• Authors: Andreas Reeb*, Volker Schulze, Kay André Weidenmann
• Keywords: Al₂O₃-Fibers, Composite Extrusion, Hybrid Composite, Interface, Microstructure, Push-Out

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