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 paper we document the interface formation of pure Al and binary Al-alloys on a mild steel
substrate by means of isothermal wetting experiments. Tests were carried out employing the sessile
droplet method in a controlled atmosphere. 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.
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