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Semi-Finished Material and Semi-Solid Forging of Sic Particle Reinforced Al-Mg Light Metal Matrix Composites – New Results on Process Development and Characterisation

By Martin Wenzelburger, Selahattin Babat, Helen V. Atkinson and Rainer Gadow

Abstract

This paper was presented at the 12th International ESAFORM Conference on Material Forming, Twente, The Netherlands, April 27-29 2009, and published in the Proceedings.Particle reinforced light metal matrix composites (MMC) were manufactured by thermal spraying of semi-finished material (atomisation and co-deposition of reinforcement particles and metal melt), followed by inductive reheating and semi-solid forging. The matrix alloy was Al Mg3, silicon carbide was used as particulate reinforcement.\ud Semi-finished material processing was optimised regarding particle size and temperature distribution during material deposition in order to obtain a suitable microstructure for subsequent semi solid processing. Twin wire electric arc spraying with cored wires was applied, providing the matrix and reinforcement materials at the same time for simultaneous deposition. Process analysis was made by in-flight particle diagnostics. Semi-solid processing ability of the MMC material after thermal spraying was verified by manual deformation testing. Inductive reheating of the particle reinforced material was coupled with fast semi-solid forging by an axial press into a closed, plate-shaped die.\ud Optical and Scanning Electron Microscopy showed some inhomogeneity in the SiC particle distribution. However, mechanical properties from tensile and 4-point bending experiments were encouraging

Topics: Composite Material, Metal Matrix Composite, Aluminium-Magnesium Alloy, Particulate Reinforcement, Silicon Carbide, Thermal Spraying, Twin-Wire Electric Arc, Semi-Solid Processing, Thixoforging
Publisher: ESAFORM (European Scientific Association For Material Forming)
Year: 2009
OAI identifier: oai:lra.le.ac.uk:2381/8774

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