Publication:
Effects of processing on the properties of aluminum-cerium-based alloys

dc.contributor.advisor Suárez, O. Marcelo
dc.contributor.author Vázquez, Mairym
dc.contributor.college College of Engineering en_US
dc.contributor.committee Calcagno, Bárbara O.
dc.contributor.committee Ríos, Orlando
dc.contributor.department Department of Materials Science and Engineering en_US
dc.contributor.representative Maldonado-Cardenales, Noemí
dc.date.accessioned 2021-01-19T13:24:14Z
dc.date.available 2021-01-19T13:24:14Z
dc.date.issued 2020-12-09
dc.description.abstract This research seeks to characterize Al-Ce-based alloys processed via different routes. These production methods include powder-in-tube, gravity casting, and powder extrusion. Al-Ce alloys samples were made by gravity casting and powder-in-tube and characterized to assess the effects of Ce levels and processing method on the properties of the material. Also, Al-Ce-Mg samples were prepared via powder extrusion and powder-in-tube. These samples were characterized and compared to the cast specimens to have a better understanding of the effect of processing on the material properties. General characterization included x-ray diffraction, electron microscopy, optical microscopy, density measurements, tensile tests, as well as Vickers and Rockwell hardness tests. The present research demonstrated that: a) there exists a linear correlation between material hardness and Ce level in cast Al-Ce specimens; b) Ce at hypereutectic level on Al-Ce samples via powder-in-tube favors a reaction with Fe and Ni at the interface between the specimens and the sheathing material, avoiding the formation of the Fe-containing needle-like phase. c) Outstanding tensile strength and consolidation was achieved via powder extrusion without further thermal treatment of the material; and d) nanostructure stability in Al-Ce specimens was observed after thermomechanical processing to yield a bulk nanostructured alloy. en_US
dc.description.abstract Esta investigación busca caracterizar las aleaciones a base de Al-Ce procesadas a través de diferentes rutas. Estos métodos de producción incluyen powder-in-tube, fundición por gravedad y extrusión en polvo. Las muestras de aleaciones de Al-Ce se hicieron mediante fundición por gravedad y powder-in-tube y se caracterizaron para evaluar los efectos de los niveles de Ce y el método de procesamiento en las propiedades del material. Además, muestras de Al-Ce-Mg se prepararon mediante extrusión de polvo y powder-in-tube. Estas muestras se caracterizaron y compararon con las muestras fundidas para comprender mejor el efecto del procesamiento en las propiedades del material. La caracterización general incluyó difracción de rayos X, microscopía electrónica, microscopía óptica, mediciones de densidad, pruebas de tensión, así como dureza de Vickers y Rockwell. Esta investigación determinó que: a) existe una correlación lineal entre la dureza del material y el nivel de Ce en muestras de Al-Ce fundidas, b) El Ce a nivel hipereutéctico en muestras de Al-Ce a través de powder-in-tube favorece una reacción con Fe y Ni en la interfase entre las muestras y el material de revestimiento, evitando la formación fases en forma de aguja altas en Fe; c) Se logró una excelente fuerza de tensión y consolidación mediante extrusión en polvo sin tratamiento térmico adicional del material; and d) La estabilidad de la nanoestructura en especímenes de Al-Ce se puede retener después del procesamiento termo-mecánico para producir una aleación nanoestructurada. en_US
dc.description.graduationSemester Fall en_US
dc.description.graduationYear 2020 en_US
dc.description.sponsorship Support has been provided by Transformational Initiative for Graduate Education and Research (TIGER), US Department of Education, Title V, Part B, Promoting Postbaccalaureate Opportunities for Hispanic Americans (PPOHA) Program (#P031M140035) and by CREST Phase II: Nanotechnology Center for Biomedical, Environmental and Sustainability Applications, Grant HRD 1345156 en_US
dc.identifier.uri https://hdl.handle.net/20.500.11801/2727
dc.language.iso en en_US
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.holder (c) 2020 Mairym Vázquez en_US
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.subject Processing methodology en_US
dc.subject Aluminum en_US
dc.subject Cerium alloys en_US
dc.subject Powder extrusion en_US
dc.subject Powder-in-tube en_US
dc.subject.lcsh Aluminum alloys en_US
dc.subject.lcsh Cerium alloys en_US
dc.subject.lcsh Metal powders en_US
dc.subject.lcsh Nanostructured materials en_US
dc.title Effects of processing on the properties of aluminum-cerium-based alloys en_US
dc.type Thesis en_US
dspace.entity.type Publication
thesis.degree.discipline Materials Science and Engineering en_US
thesis.degree.level M.S. en_US
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