(ISSN: 2349-2082)

International Journal For Ignited Minds
 Published Article
Effect of Dispersoid Size and Content (SiO2) for Improved Mechanical Properties and Microstructure of LM-13
Mohammed Dastagir , Muzamil Khan S.F, Irfan Pasha, Syed Saquib Uzama & Zahoor Ahmed Shariff
Metal Matrix Composites (MMC’s) have been developed to meet the demand for lighter materials with high specific strength, stiffness and wear resistance. Among Metal matrix composites particulate reinforced Aluminum matrix composites are attractive due to significant improvements in mechanical and physical properties like such as superior strength to weight ratio, good ductility, high strength and high modulus, low thermal expansion coefficient, excellent wear resistance, excellent corrosion resistance, high temperature creep resistance and better fatigue strength. Aluminum based MMC's find wide applications in aerospace, automobiles and marine sectors, etc. The mechanical properties of Aluminum matrix composites are strongly dependent on microstructural parameters like shape, size, volume fraction and distribution of reinforcement particles which have to be carefully chosen. Therefore, judicious selection of the variables is important to optimize the properties of the composites. The present investigation is aimed at studying the effect on microstructure and mechanical properties of Aluminum alloy (LM-13) a hybrid metal matrix composites by varying dispersoid size and content Silica (Sio2). The size of the Silica (Sio2) particles varies from 1, 3 and 5mm and amount of addition varies from 4.25 to 11.76wt% in steps of 4.25wt%. Stir casting process was used to produce cast Aluminum alloy - silica particulate composites in moulds. The microstructure and hardness of the fabricated composite were analyzed and reported. Above prepared composites are subjected to the mechanical testing as per the ASTM standards. The investigation reveals that there is a significant improvement in the mechanical properties of the composite. The tensile strength and hardness were found to increase with the increase in the wt% of SiO2 reinforcement.
Aluminum alloy (Lm-13), chill casting, Silica (SiO2), hardness, microstructure, stir casting.
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