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Experimental Investigations on Property Evaluation of Al-Alloy Reinforced with Nano Ceramic Particulates based Metal Matrix Composites (NMMC’s) Subjected to Forging


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1 Department of Mechanical Engineering, Sir M Visvesvaraya Institute of Technology, Bangalore, India
     

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This paper involves the Mechanical property Evaluation of Al- Alloy (T6-6061) reinforced with Nano Ceramic Particulates (ZrO2) subjected to forging process. The standard Aluminum alloy ingots/blocks is melted and superheated in the electrical resistance furnace for about 8 hours at 7500 C. The superheated melt was reinforced with zirconium dioxide particulates by varying weight percentages in 3, 6 and 9 percent. The molten metal mixture was poured in a metal die of cylindrical shape having dimensions 300mm X 20mm diameter and allowed to solidify at ambient temperature, the sample were subjected to hand forging process. The microstructural characterization of forged composite specimen exhibits more or less uniform distribution of ZrO2 particulates. The grain structure with spherical morphology of secondary magnesium and silicon phase in the Aluminum matrix whereas the unforged composite sample indicates coarse with dendrite type morphology. The strength results in terms of forged composite specimen reveals significant improvement in the tensile strength over the unforged composite specimen due to refined grain structure. The hardness result also reveals significant improvement in the forged and reinforced samples over the matrix alloy.

Keywords

Nanocomposite, Solidification, Critical Particle Size, Strengthening, Grain Refinement.
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  • Experimental Investigations on Property Evaluation of Al-Alloy Reinforced with Nano Ceramic Particulates based Metal Matrix Composites (NMMC’s) Subjected to Forging

Abstract Views: 227  |  PDF Views: 0

Authors

S. Shivakumar
Department of Mechanical Engineering, Sir M Visvesvaraya Institute of Technology, Bangalore, India
G. Balakumar
Department of Mechanical Engineering, Sir M Visvesvaraya Institute of Technology, Bangalore, India

Abstract


This paper involves the Mechanical property Evaluation of Al- Alloy (T6-6061) reinforced with Nano Ceramic Particulates (ZrO2) subjected to forging process. The standard Aluminum alloy ingots/blocks is melted and superheated in the electrical resistance furnace for about 8 hours at 7500 C. The superheated melt was reinforced with zirconium dioxide particulates by varying weight percentages in 3, 6 and 9 percent. The molten metal mixture was poured in a metal die of cylindrical shape having dimensions 300mm X 20mm diameter and allowed to solidify at ambient temperature, the sample were subjected to hand forging process. The microstructural characterization of forged composite specimen exhibits more or less uniform distribution of ZrO2 particulates. The grain structure with spherical morphology of secondary magnesium and silicon phase in the Aluminum matrix whereas the unforged composite sample indicates coarse with dendrite type morphology. The strength results in terms of forged composite specimen reveals significant improvement in the tensile strength over the unforged composite specimen due to refined grain structure. The hardness result also reveals significant improvement in the forged and reinforced samples over the matrix alloy.

Keywords


Nanocomposite, Solidification, Critical Particle Size, Strengthening, Grain Refinement.

References