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

다국어 초록 (Multilingual Abstract)

In the present work, x wt% B4C(x = 2, 4, 6, 8) and 2 wt% BN reinforced aluminum 6061 metal matrix hybrid compositeswere synthesized by mechanical milling for 10 h. The milled powders were consolidated by cold uniaxial compaction atvarious compression pressure (200–800 MPa) and then sintered at various temperatures (400–600 °C). Microstructuralcharacterization of the milled powders and the fabricated composites were performed by X-ray diffraction, scanning electronmicroscope, and energy dispersive spectroscopy techniques. The effect of B4C/BN reinforcements on the densification ofthe milled powders was studied in terms of compressibility and sinterability. The mechanical properties, specifically thegreen compressive strength, and hardness of the composites were also investigated. The empirical relations formulated byHeckel, Panelli-Filho, and Ge were used to plot the compressibility curves of the developed composites to study the compressibilitybehavior of the milled powders. The densification co-efficient (K) of the powders and sinterability behavior ofthe composites decreased with an increase in B4Creinforcement. B4Cparticles prevented the grain growth by seizing thegrain boundary, resulting in refinement of grains and enhancement in mechanical properties The maximum compressivestrength of 249 MPa and hardness of 184 HV was observed for the sample Al6061–8 wt% B4C–2 wt% BN compressed at800 MPa and sintered at 600 °C.

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