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Influence of Dispersoid Content on Compressibility, Sinterability and Mechanical Behaviour of B4C/BN Reinforced Al6061 Metal Matrix Hybrid Composites Fabricated via Mechanical Alloying

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Abstract

In the present work, x wt% B4C (x = 2, 4, 6, 8) and 2 wt% BN reinforced aluminum 6061 metal matrix hybrid composites were synthesized by mechanical milling for 10 h. The milled powders were consolidated by cold uniaxial compaction at various compression pressure (200–800 MPa) and then sintered at various temperatures (400–600 °C). Microstructural characterization of the milled powders and the fabricated composites were performed by X-ray diffraction, scanning electron microscope, and energy dispersive spectroscopy techniques. The effect of B4C/BN reinforcements on the densification of the milled powders was studied in terms of compressibility and sinterability. The mechanical properties, specifically the green compressive strength, and hardness of the composites were also investigated. The empirical relations formulated by Heckel, Panelli-Filho, and Ge were used to plot the compressibility curves of the developed composites to study the compressibility behavior of the milled powders. The densification co-efficient (K) of the powders and sinterability behavior of the composites decreased with an increase in B4C reinforcement. B4C particles prevented the grain growth by seizing the grain boundary, resulting in refinement of grains and enhancement in mechanical properties The maximum compressive strength of 249 MPa and hardness of 184 HV was observed for the sample Al6061–8 wt% B4C–2 wt% BN compressed at 800 MPa and sintered at 600 °C.

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Acknowledgements

The authors would like to acknowledge Dr. S.K.S Parashar (Nano Synthesis Lab, School of Applied Science) and School of Mechanical Engineering, KIIT Deemed to be University, Bhubaneswar, India for their metal powder synthesis, composite fabrication and testing facilities.

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  1. School of Mechanical Engineering, KIIT Deemed to be University, Bhubaneswar, Odisha, 751024, India

    Sudipta Chand, Polymersetty Chandrasekhar, Sudesna Roy & Saranjit Singh

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Correspondence to Polymersetty Chandrasekhar.

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Chand, S., Chandrasekhar, P., Roy, S. et al. Influence of Dispersoid Content on Compressibility, Sinterability and Mechanical Behaviour of B4C/BN Reinforced Al6061 Metal Matrix Hybrid Composites Fabricated via Mechanical Alloying. Met. Mater. Int. 27, 4841–4853 (2021). https://doi.org/10.1007/s12540-020-00739-0

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