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 ...
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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 weightpersentages (0.2,0.6,1%). The matrix alloy and the composite materials wereprepared by casting methode and using vortex technique in order to dispersreinforced prticles in homogeneous way on the matrix alloy floor. In addition tothat, two main groups of composite materials, the first group included compositematerial reinforced by (SiC) particles represented by the particle size(30μm≥p.size≥0.1μm) while the second group included composite materialreinforced 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 testto either matrix alloy and product composite material. The study contained theeffect of solution heat treatment at (520C ْ) for (1hr) and the following formingprocess in addition to double aging process were made for the prepared model offatigue 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 theincrease in reinforced particles that were added, but staying at higher values thanthat in the matrix alloy, The effect of type for reinforced particles in this propertywas noted, There was a specified increase in fatigue resistance of compositematerial reinforced by (B4C) particles in comparasion with the reinforced by (SiC)particles. Their values were more than in the matrix alloy.
