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Comparative study of tribomechanical properties of B4C/Gr and SiC/Gr reinforced AA6061 hybrid nanocomposites via stir-ultrasonic-squeeze casting
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DOI：10.1080/09276440.2026.2630148.png)
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Abstract
En 中文
This study presents a comparative evaluation of AA6061-based aluminium metal matrix hybrid nanocomposites reinforced with B4C/Gr and SiC/Gr nanoparticles, fabricated using a novel stir - ultrasonic - squeeze casting route. Five compositions - as cast AA6061 alloy (AA6061), AA6061 + 2 wt.% B4C + 2 wt.% Gr (AA2B2G), AA6061 + 3 wt.% B4C + 2 wt.% Gr (AA3B2G), AA6061 + 2 wt.% SiC +2 wt.% Gr, (AA2S2G), and AA6061 + 3 wt.% SiC +2 wt.% Gr (AA3S2G) - were synthesised. SiC - Gr composites exhibited superior grain refinement (minimum grain size of 35.49 & micro;m), attributed to enhanced heterogeneous nucleation and favourable interfacial thermal characteristics. Hardness increased from 52.67 BHN (as-cast) to a maximum of 69.55 BHN for AA3S2G. Tensile properties showed similar improvement. Hall - Petch analysis revealed that variations in the slope coefficient (k) reflect interface-controlled dislocation blocking rather than grain refinement alone. Although B4C-Gr composites exhibited a higher Hall - Petch slope, SiC-Gr systems achieved higher absolute hardness and tensile strength due to improved dispersion and more effective interfacial load transfer. Tribological studies showed that SiC-Gr composites promote a stable, adherent graphite-rich tribofilm, resulting in lower friction and wear, whereas B4C-Gr systems exhibited tribofilm disruption due to interfacial debonding and third-body abrasion.
Keywords:
Stir-ultrasonic-squeeze casting
aluminium metal matrix hybrid nanocomposites
SiC
B4C, aluminium alloy
Journal
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2.4
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85
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2.1K
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