Preparation and Characterization of AA6061 Aluminum Alloy Composite Reinforced With Different Contents of Blast-Furnace
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.387
Preparation and Characterization of AA6061 Aluminum Alloy Composite Reinforced With Different Contents of Blast-Furnace Slag by Powder Metalurgy Emmanuel P. R. Lima1, Pedro C. de Lima2, Paulo X. A. Filho3, Nélio S. Furtado3 UnB – FGA – Universidade de Brasília – Faculdade do Gama, Área Especial, Projeção A, Setor Leste, Gama/DF/Brazil CEP: 72444-240. 1
Instituto Federal da Bahia – IFBA – Campus Barreiras, Av. das Várzeas s/n, Centro, Barreiras/BA/Brazil CEP: 47805-970. 2
Programa de Pós-Graduação em Integridade de Materiais de Engenharia – Universidade de Brasília – FGA, Área Especial, Projeção A, Setor Leste, Gama/DF/Brazil CEP: 72444-240. 3
ABSTRACT
The constant search for the improvement of the performance of materials of industrial application, evaluated under aspects of weight reduction, greater resistance, greater resistance to wear and better thermal stability, among others, associated with the search for the development of ecologically viable products, that convert the context of environmental degradation in preservation and sustainability, reflects the need to conduct research that results in new materials. The objective of this work is to obtain composites of the AA6061 aluminum alloy reinforced with different contents of coke coal blast-furnace slag by powder metallurgy. The processing of these materials was done by sieving, mixing and compacting powders of reinforced aluminum alloy with 5, 10 and 15% of blast-furnace slag. The cold uniaxial compaction was realized at a pressure of 500MPa. The obtained materials were sintered at 580°C for 3h under inert atmosphere. Unreinforced aluminum alloy samples were also produced. The characterization of the materials was realized by density and hardness measurements and three-point bending tests. The analysis of its microstructure was realized by scanning electron microscopy. As results, the composites presented a homogeneous distribution of the reinforcing particles and also a progressive improvement of the hardness and the bending strength with the increase of the slag content, producing an increase of 79% in hardness and 128% in flexural strength, when compared to the material without
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reinforcement obtained by the same process. Such results give the coke coal blast-furnace slag a new possibility of exploitation in the metal-mechanical sector, besides contributing with the environmental issue.
INTRODUCTION Metal-matrix composites (MMC) are materials in which at least one of its components is metal or metal alloy creating a matrix, in a manner that the other component, the support, is completely embraced by the first1. In spite of the great physical-chemical and mechanic combinations, allied to low weight, and easy of processing, aluminum
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