· Aleaciones ligeras ·
Salem Seifeddine and Ingvar L Svensson
Jönköping University, School of Engineering,Component technology, Sweden
67th World Foundry Congress
In order to study the isolated influence of microstructure and alloying
elemets on the mechanical properties of Al-7%Si based alloys, the level of
defects arising from the melt handling and cast process needs to be
minimized. Therefore, gradient solidification technology has been applied,
providing tensile test samples with a low content of defects and a well-fed
homogenous microstructure. In the present work, the influence of cooling
rate and Mg, Cu, Fe and Mn on the as-cast microstructure formations and
mechanical properties such as ultimate tensile strength, yield strength,
elongation to fracture etc. has been elucidated. While Cu and Mg
strengthen the material, Fe deteriorates mostly the elongation. The length
of Al5FeSi-needles appears to be a function of the cooling rate and not of
the content of iron in the melt.
