(ISSN: 2349-2082)

International Journal For Ignited Minds
 Published Article
Microstructure and Hardness Studies of Magnesium-Aluminum Alloy and Fused Silica Particulate Composite
Hyder Khurshid , Md. Iqbal, Wajid Ali, Syed Faisal Ahmed & Zahoor Ahmed Shariff
The present investigation is aimed at studying the effect of dispersoid content and effect of chill on microstructure and mechanical properties of Magnesium (Mg) reinforced with aluminum alloy (LM-13) hybrid metal matrix composites with Silica (Sio2). The size of the Silica (Sio2) particles varies from 50 to 80 µm. volumetric heat capacity (VHC), and its effect on the microstructure evolution was examined by using copper chill. Stir casting process was used to produce chill cast magnesium-aluminum alloy-silica particulate composites in moulds containing copper chill to accelerate the solidification. The fabricated composites were tested for their hardness and ultimate tensile strength properties according to ASTM standards. The effect of chill and reinforcement characteristics was presented and compared with the hybrid composite without chill material. Microstructural studies of the chill cast composite developed indicate that there is uniform distribution of the reinforcement in the matrix alloy with significant grain refinement and retention of residual porosity. Mechanical properties reveal that the presence of silica particulates has improved significantly the ultimate tensile strength and hardness as compared against the matrix alloy. The results confirm the positive relationship between mechanical behavior and the dispersiod content. The copper chill cast composite with 84.03wt% Mg, 8.4wt% Lm-13 and 7.56wt% Si02 was found to increase mechanical properties.
Aluminum alloy (Lm-13), Magnesium (Mg), Chill Casting, Silica (Si02), Stir Casting, Hardness, Microstructure.
 Download Article