Hot Deformation And Mechanical Properties
Of P/M Al Special
Author(s)
M. Tercelj, P. Cvahte, I. Perus & G. Kugler
Abstract
Almost pure aluminum composite, P/M Al-special, with an average grain
diameter of 1μm with oxides on the grain surface was produced by a powder
metallurgy route. Billets were extruded on an indirect press at various
temperatures and ram-speeds. Specimens made from an extruded profile were
additionally annealed at 300ºC at various times. Hot workability of these various
initial states was studied by hot compression tests in the strain rate range 0.01–
10 s-1, the temperature range 300–580ºC up to a strain of 0.9. Additionally tensile
tests were carried out to determine the mechanical properties on specimens
previously annealed at 300ºC. The oxide surface prevents grains coarsening
during hot deformation and consequently excellent mechanical properties of the
specimens annealed at a temperature of 300ºC were obtained.
Keywords: P/M 1080 Al composite, hot extrusion, annealing, hot compression,
mechanical properties.
1 Introduction
Demands for weight reduction of parts applied in cars and aircrafts has lead to
the replacement of conventional materials with lighter and stronger materials.
Aluminum alloys have a great potential for this application but their weaknesses
are too low strength and stiffness. On the other hand production of parts from
metal-matrix composites which is based on the reduction of grain size is very
promising due to their unique mechanical properties in comparison with coarsegrained
materials [1–6].
Powder (P/M) and ingot metallurgy which include particle reinforcement
mixing with solid or molten metal assure production of composites with
Keywords
P/M 1080 Al composite, hot extrusion, annealing, hot compression,
mechanical properties
Related Book
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