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Superior Mechanical Properties of Aluminium Matrix Composites Fabricated through Modified Matrix Encapsulated Feeding Method

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Abstract

Aluminium matrix composites (AMCs) play a vital role in constructing aircraft, marine and automobile components. The major issue in manufacturing of AMCs through stir casting method is a localized ceramic particles agglomeration. In current research, metal castings have been prepared with 97.5 wt% of aluminium alloy (AA 7075) and 2.5 wt% of nano-alumina (n-Al2O3) particles through a modified matrix encapsulated feeding technique. The tensile strength, microhardness and dry sliding wear behaviour of n-Al2O3 reinforced AA 7075 composites were measured following ASTM standards. The ultimate tensile strength of the developed AMCs varies from 280 to 315 MPa, which is 12.5% higher than unreinforced AA 7075 alloy. Yield strength increases from 140 to 158 MPa, whereas microhardness of the composites increases from 138 to 210HV. Due to homogeneous distribution of n-Al2O3, the overall wear resistance of n-Al2O3 reinforced AA 7075 composites increases up to 90% as compared to unreinforced AA 7075 alloy. Also, the addition of n-Al2O3 particles marginally reduces the network of microcracks and deep furrows in the worn surface. The microstructural and elemental studies are also performed through scanning electron microscopy and X-ray diffraction.

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Acknowledgements

This research work funded by Science & Engineering Research Board, under Department of Science & Technology under the Govt. of India [DST-SERB (File No.YSS/2015/000823) and Aeronautics Research and Development Board (ARDB)—DRDO under the Govt. of India [AR&DB-DRDO (File No. AR&DB/01/2031808/M/1)]. The authors would like to thank DRDO, DST-SERB and the management of Selvam College of Technology for the support rendered to conduct the experiments.

Funding

Mission on Nano Science and Technology, YSS/2015/000823, R Sasikumar, Aeronautics Research and Development Board, AR&DB/01/2031808/M/1, R Sasikumar.

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Correspondence to S. Prakash.

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Prakash, S., Suresh, P., Sasikumar, R. et al. Superior Mechanical Properties of Aluminium Matrix Composites Fabricated through Modified Matrix Encapsulated Feeding Method. Trans Indian Inst Met 77, 707–716 (2024). https://doi.org/10.1007/s12666-023-03144-4

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