Abstract
When AlCu alloys are in the θ′ precipitation state, they exhibit a peak (P2) in their internal friction spectrum as a function of the temperature. In this connection, an unreinforced Al-4% Cu alloy and some Al-4% Cu based metal matrix composites (MMC) reinforced with 10%, 20%, and 30% Al2O3 fibers were characterized by internal friction measurements (IF or Q−1). The microstructure of the AlCu based composites has been found particularly favorable for the appearance of the P2 peak, and enhances θ′ relaxation. This kind of result has led us to a new interpretation of θ′ relaxation in AlCu alloys. θ′ relaxation is important in AlCu based composites because the expected industrial utilization temperature of these materials is around 250 °C, and this implies a θ′ precipitation state for their working conditions.
Published Version
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