Abstract
The presnt research had dealt with preparation of bars with length of about (13Cm)
and a diameter of (1.5Cm) of composite material with metal matrix represented by
(Al-Si-Mg) cast reinforced by (SiC) or (B4C) particles with choosen weight
persentages (0.2,0.6,1%). The matrix alloy and the composite materials were
prepared by casting methode and using vortex technique in order to dispers
reinforced prticles in homogeneous way on the matrix alloy floor. In addition to
that, two main groups of composite materials, the first group included composite
material reinforced by (SiC) particles represented by the particle size
(30μm≥p.size≥0.1μm) while the second group included composite material
reinforced by (B4C) particles represented by the particle size
(25μm≥p.size≥0.1μm).
Concerning test that were made for the prepared models, they included fatigue test
to either matrix alloy and product composite material. The study contained the
effect of solution heat treatment at (520C ْ) for (1hr) and the following forming
process in addition to double aging process were made for the prepared model of
fatigue test and included the aging at (150C ْ) for (2hr) and then aging at (170C (ْ
during different periods.
Results of fatigue test showed an increase in fatigue resistance in addition to the
increase in reinforced particles that were added, but staying at higher values than
that in the matrix alloy, The effect of type for reinforced particles in this property
was noted, There was a specified increase in fatigue resistance of composite
material reinforced by (B4C) particles in comparasion with the reinforced by (SiC)
particles. Their values were more than in the matrix alloy.
Keywords
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