Banca de QUALIFICAÇÃO: ALDO MENDES PANDOLFI
Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.STUDENT : ALDO MENDES PANDOLFI
DATE: 29/04/2024
TIME: 10:30
LOCAL: Virtual
TITLE:
Processing and mechanical, thermal and electrical characterizations of the 1350 aluminum matrix nanocomposite with graphene nanoreinforcement processed via fusion under electromagnetic induction and inert atmosphere.
KEY WORDS:
Graphene, aluminum alloys, nanocomposites, mechanical properties, resistivity, conductivity, DC casting, electromagnetic stirring melting, inert atmosphere
PAGES: 75
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Metalurgia Física
SPECIALTY: Propriedades Físicas dos Metais e Ligas
SUMMARY:
The global climate warming crisis has made urgent the need to reduce greenhouse gas emissions from motor vehicles and, consequently, the automotive industry to passed to adopt the guideline of continuous vehicle weight reduction with a view to improving fuel use efficiency and reducing emissions, concomitantly accelerating the replacement of combustion engine vehicles by electric engine vehicles. To carry out this demand, it became necessary to develop lighter materials, but without loss of strength and durability. The advent of electric vehicles has made the demand for lighter materials even more emerging, but with increased conductivity and resistivity properties, given the need to increase the autonomy of electric vehicles. In this scenario, aluminum alloys and graphene become important materials when combined in the form of nanocomposites. In this work, we sought to improve the metallurgy process to obtain the aluminum-graphene alloy nanocomposite by adopting eletromagnetic induction melting under inert atmosphere, which, through the electromagnetic stirring of the molten bath, improves the dispersion of graphene in the metal matrix after cooling. The nanocomposite to be obtained will consist of an 1350 aluminum alloy matrix, and graphene as reinforcement. The added graphene content will be in the proportions of 0.5%, 1% and 2% by weight. To obtain the specimens by melting in an induction furnace, adaptations to avoid oxidation were performed with the use of a nitrogen gas (N2) atmosphere. The characterizations of morphology and microstructures of the samples produced were performed by scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS) analysis, also used to determine the percentage of carbon, the degree of incorporation and distribution of graphene fractions in the metallic matrix and to evaluate their morphologies. The characterization of the mechanical properties was carried out through tensile strength tests, Vickers microhardness; and for the characterization of the thermal-electrical properties, resistivity and thermal diffusivity tests were carried out, through the thermal quadruple method (laser flash) to evaluate the thermal properties (thermal diffusion). It is intended that in the nanocomposite, the reinforcing graphene is homogeneously distributed and located both in the matrix and in clusters, so that the mechanical properties do not present significant reductions, but that the conductivity and resistivity properties can result in a significant reduction of electrical resistance and that there is an increase in thermal diffusivity.
COMMITTEE MEMBERS:
Presidente - SIDNEY NICODEMOS DA SILVA
Interno - CLAUDINEI REZENDE CALADO
Externo ao Programa - ALMIR GONCALVES VIEIRA