During casting and homogenisation of aluminium the microstructural fundament for
further processing is made. Particle structure (dispersoids and primary particles), grain structure and
level of elements in solid solution govern the mechanical and annealing properties of the material.
In 3xxx-alloys, Mn in solid solution and Mn-containing dispersoids formed during homogenisation
play an important role in controlling the recrystallization behaviour of the material [e.g. 1, 2, 3].
Other elements, such as Si, will have an influence on the formation of dispersoids [4, 5]. Hence, to
control the annealing behaviour of the material, it becomes important to control the particle
structure. In the present investigation, an AA3103 alloy, and modified versions of this alloy, have
been investigated. Various homogenisation treatments have been performed and the resulting
material has been studied. Electrical conductivity has been measured and microstructural
investigations have been carried out.