Cortés-Urrego, Natalia

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Thermomechanometric study of AI-Cu-B composites reinforced with diboride particles
(2011) Cortés-Urrego, Natalia; Suárez, O. Marcelo; College of Engineering; Quintero, Pedro; Banerjee, Jayanta; Department of Mechanical Engineering; Velazquez, Carlos
Al-Cu composites reinforced with diboride particles were fabricated by gravity casting. A thermomechanical analysis (TMA) system allowed studying hardness and creep behavior of the composites. The composite hardness was investigated at 300ºC and 1N of compressive load. The results showed that Brinell hardness at room and high temperature presented a similar behavior: as boron concentration in the composite increases (more diboride particles) hardness increases as well. The composite compressive creep behavior was investigated at 400ºC and 500ºC under three loads (1N, 0.7N and 0.5N). The results showed that the compressive creep resistance of Al2.5%Cu-4%B was better compared with the Al-2.5%Cu-0%B (alloy without reinforced) demonstrating the effectiveness of the reinforcing particles. Secondary creep rates (ε) observed in the composites are smaller when higher concentration of reinforcements were present. The stress exponent revealed on the material was close to 3 for all concentration; in which viscous slip deformation plays an important role in the creep deformation. The computed activation energy for creep revealed a different behavior compared to most metal matrix composites.