Extrusion of Ingot and Powder Metallurgy Aluminum Matrix
Marcela Lieblich, Gaspar González-Doncel, Joaquín Ibáñez, Ricardo Fernández,
VirginiaVadilo, CENIM-CSIC, Madrid, Spain,
Pilar Rey, Alfonso Vázquez, Gemma Castro, AIMEN, Porriño, Spain
Track: EXTRUSION/DIE THEORETICAL - Composites and Nonconventional Materials
ABSTRACT—Several profiles with the same extrusion ratio were extruded from three
monolithic alloys and five aluminum matrix composites (AMCs), prepared by ingot and powder
metallurgy (PM). Specifically, AA6061 and AA6063 were reinforced by 10 and 25 vol. % of
Al2O3 and MoSi2 intermetallic particles. To study the wear of the dies, high temperature pin-ondisk
tests were performed. The results show that the composite profiles present high surface and
dimensional quality, and that the die steel wears slightly more against the cast composite.
Maximum extrusion pressure (Pmax) depends on profile shape, and increases in the following
order: bar, T, L and U, and tube. It also increases as volume fraction of reinforcement increases.
In general, cast materials are easier to extrude than PM ones, and MoSi2 reinforced AMCs are
easier to extrude than Al2O3 ones. AMCs processed by PM have significantly higher hardness
than the cast AMC and the monolithic alloys. The PM composites do not need any heat treatment
to acquire maximum hardness. By adding reinforcing particles to aluminum, a significant increase
in tensile strength and stiffness occur. The high tensile strength and modulus of the present PM
composites, without a decrease in specific properties, makes these AMCs interesting for structural
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