Florián Algarín, David J.

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    Study of portevin-le chatelier phenomenon in Al-Mg alloys treated with nanoparticles
    (2019-12-09) Florián Algarín, David J.; Suárez, O. Marcelo; College of Engineering; Suárez Colche, Luis E.; López, Ricardo R.; Acosta Costa, Felipe J.; Department of Civil Engineering; Cancelos Mancini, Silvina
    This dissertation focuses on the study of the Portevin-Le Chatelier (PLC) phenomenon in Al-Mg (aluminum-magnesium) alloys. First, the research centered on the development of methodologies for the effective insertion of nanoparticles in an aluminum matrix. In these studies, Al2O3 and MoB2 nanoparticles were incorporated in pure aluminum and A206 alloy matrix to evaluate the effect of these reinforcements on the mechanical and electrical properties of the composites and the effectiveness of the methods developed. Second, the research studied the PLC phenomenon when Al/NbB2 nanocomposite pellets prepared via high-energy ball milling, and A206 - 1 wt.% Al2O3 nanocomposites are present in a magnesium-supersaturated Al matrix. The nanocomposites were added into a molten Al-Mg alloy to produce cylindrical ingots. These were subsequently cold-rolled to obtain wires with 1 mm diameter to produce specimens for standard tensile tests. Prior to the tensile test, the samples underwent a 30 minute solution treatment at 300 C, followed by ice-water quenching. As expected, the results corroborated that the phenomenon was observable only in the specimens bearing the solution treatment. The phenomenon was observable as the material entered the plastic region of the stress-strain curves. The results obtained in this thesis clearly demonstrated what the addition of the Al2O3, and NbB2 nanoparticles attenuated the serrated signal amplitude of the PLC phenomenon.