Regensburg 2007 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 29: Intermetallic phases II
MM 29.3: Talk
Thursday, March 29, 2007, 12:15–12:30, H16
Interface Reaction and its Kinetics of Al and Binary Al-alloys on Mild Steel Substrates — •Werner Fragner1, Roman Sonnleitner2, Peter Uggowitzer3, and Jörg Löffler3 — 1ARC Leichtmetallkompetenzzentrum Ranshofen GmbH — 2ECHEM, Kompetenzzentrum f. Angewandte Elektrochemie GmbH — 3Metal Physics and Technology, Department of Materials, ETH Zurich
To meet the requirements of weight-saving and low-cost production of components for future transport vehicles, the concept of multi-material mix is of increasing importance. In this context aluminum-iron compounds produced by means of compound casting are considered to be of particular importance. An essential and critical aspect of such compound castings is the formation of intermetallic phases (IMP) at the Al-Fe interface. Both the nature and the kinetics of potential IMPs are not well understood and require a systematic investigation. In this presentation we document the interface formation of pure Al and binary Al-alloys on a mild steel substrate by means of isothermal wetting and dipping experiments. Tests were carried out employing the sessile droplet method in a controlled atmosphere and inserting plates into the melt. Using pure Al and Al7Si, Al7Cu, and Al7Zn alloys the interface reactions were investigated by quantitative metallography (LOM, SEM/EDX). Special attention was paid to the influence of the alloying elements on the type and sequence of IMPs at the interface and the kinetics of the interface formation with influences of environmental conditions like surface treatment and additional elements present in the melt.