Mechanical Properties of Composite AA2024 Matrix with Aluminium Carbide Dispersed by High Energy Milling
Dispersion strengthened aluminium composites have been prepared by mechanical alloying. At this work were studied the turning conditions to getin situformation and dispersion of Al4C3on 2024 alloy by graphite addition. The alloy matrix was obtained by attrition milling a mixture of starting powders; further additions of carbon (2,5; 5 and 10% wt) were performed by means of a planetary mill. Through an adequate sintering the reinforcement formation was showed by X-Ray diffraction analysis of powders with milling times next to 20 hours. The microhardness values appointed that mechanical properties were held even soft material addition (graphite) and improved by age hardening. Pin-on-disc test revealed the composite have low friction coefficient, due to lubricant carbon action and enough low volumetric wear due to high hardness of bulk Al4C3reinforcement.