Abstract
The aim of this work is to investigate the influence of the addition of silicon carbide and molybdenum disulfide on the microstructure and the tensile strength of the Al-Flyash hybrid composites prepared using the stir casting technique. The composite with aluminum 6061 alloy as the matrix and flyash as the reinforcement, with different weight fractions, is investigated to study its microstructure and the tensile strength. The same has been compared with the hybrid composites with Aluminum-Flyash/SiC and Aluminum-Flyash/MoS2 for different weight fractions of the reinforcements. The tensile tests were conducted as per ASTM standard testing procedures at room temperature. From the results it is identified that tensile strength of the Al6061-Flyash composite is lesser than the Al6061-Flyash/SiC and Al6061-Flyash/MoS2 hybrid composites. It is also observed that increment in the composition of the SiC and MoS2 causes the increment in the tensile strength of the hybrid composite. This increment in the tensile strength is due to good interface bonding and uniform distribution of the reinforcements in the composite.
Highlights
Materials selected so far are particulate reinforced metal matrix composites (MMCs) which have the advantage that they are nearly isotropic [1]
The microstructure of the composite demonstrates the uniform distribution of flyash content in the aluminum matrix
The Si and Mg in the Al6061 alloys were 0.6 to 0.8%, and the increased percentage of those elements shows the addition of flyash in the composite
Summary
Materials selected so far are particulate reinforced metal matrix composites (MMCs) which have the advantage that they are nearly isotropic [1]. Al2O3, boron carbide (B4C), and graphite are common reinforcements for aluminum matrices. The flyash as reinforcement in the aluminum matrix has the wide range of scope in area of mechanical behavior [2,3] of the composites. Aluminum matrix with flyash particulate reinforced composite has a lower density than aluminum which leads to weight reductions in the areas of aerospace and automobiles. The increment in the flyash leads to decrement in the strength of the aluminum composite. It is recommended to use the hybrid aluminum metal matrix composites such that the other reinforcements gives the better strength to the composites
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