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Characterization of Al-Si Alloy Reinforced with B4C and TiO2 Nanoparticles

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Abstract

Al-Si alloy as a matrix in Aluminium Metal Matrix Composites (AMCs) augments the hardness and strength. The work reports the characterization and mechanical properties of Hybrid Aluminium Metal Matrix Nanocomposites (HAMNCs) using Hypereutectic Al-Si grade LM30 alloy as the matrix with boron Carbide (nB4C) and Rutile (nTiO2) nanoparticles as reinforcements. Liquid metallurgy route ultrasonic squeeze-assisted stir-casting was employed to manufacture hybrid formulations. The HAMNC specimens were fabricated by maintaining 1 wt.% of nB4C and by varying TiO2 nanoparticles in steps of 0.25 wt.% in the 0 to 1 wt.% range. The optical micrographs revealed that ultrasonic vibration and squeeze casting effects aided the uniform distribution of nano reinforcements and lowered the porosity. XRD analysis revealed the formation of Aluminum Titanium Silicate (Al4Ti2SiO12) due to the addition of nTiO2. The results highlighted that the LM30 matrix having 1.0 wt.% of nB4C and 0.75 wt.% of nTiO2 exhibited the maximum hardness of 107.2 HRB, ultimate tensile strength of 265.52 MPa, and compressive strength of 656 MPa. The tensile fractography using FESEM highlighted the various kinds of dendrites associated with the fracture. nB4C and TiO2 nano reinforcements increased energy absorption during impact failure.

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Acknowledgements

The authors thank the management and administration of the Vellore Institute of Technology for providing the research infrastructure, support and cooperation for carrying out this research work.

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D.K.P.K. designed the concept, interpreted the data and wrote the manuscript. D.G.S edited the manuscript. Both authors reviewed the manuscript.

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Correspondence to S. Darius Gnanaraj.

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Dinesh Kumar, P.K., Darius Gnanaraj, S. Characterization of Al-Si Alloy Reinforced with B4C and TiO2 Nanoparticles. Silicon (2024). https://doi.org/10.1007/s12633-024-03012-w

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