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Indirect extrusion of semi-finished aluminium-magnesium compounds

Indirektes Strangpressen von Aluminium-Magnesium-Verbundhalbzeugen
 
: Neugebauer, R.; Glaß, R.; Popp, M.; Porstmann, S.; Kittner, K.

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Materialwissenschaft und Werkstofftechnik 42 (2011), No.7, pp.585-592
ISSN: 0933-5137
German
Journal Article
Fraunhofer IWU ()

Abstract
The paper presents first results of indirect extrusion of Al/Mg compounds. In earlier tests of lateral extrusion and hydrostatic extrusion first basic insights into the compound generation were gained. The current investigation focuses on another application of the compound manufacturing approach using industrial equipment and the verification of basic results. The calculation of the material flow, the design of appropriate extrusion dies, the design and preparation of the compound billets and the selection of processing parameters are major tasks. By completely encasing the Mg core with Al material including the rod faces the pre-advancement of the core material was prevented. Two different extrusion ratios were selected in order to detect the influence of deformation on the bond generation. The billet geometry, the volume ratio between Al and Mg, the billet treatment and the processing parameters remained constant throughout the test series for better comparability of results. The process and die design were aided by FEM simulation. The main goal in calculation was a nearly equal material flow of both the Al and Mg partners. The generation of a metal bond was achieved. As already observed in lateral and hydrostatic extrusion the interface is characterised by hard brittle intermetallic phases with high failure rates due to breakage. The paper discusses failure mechanisms and means for controlling this effects.

: http://publica.fraunhofer.de/documents/N-439311.html