| Effect of SiO2 Coating on Microstructure and Mechanical
Behavior of Al-ABOw Composite Synthesized by Powder
Metallurgy Technique |
Neeraj Pandey,1, * Subash Chandra Ram,2 Indrajit Chakrabarty2 and Manas Ranjan Majhi1
Pages : 188-195
DOI : 10.1080/0371750X.2020.1798815 |
| Abstract |
| In this investigation, powder metallurgy route was employed to synthesize
SiO2 (5, 10 and 15 vol%) coated aluminium borate whisker (ABOw) reinforced
aluminium composites. Commercial pure aluminium powder was used as
matrix material and SiO2 coated ABOw was used as reinforcements.
Microstructures of the composites were characterized using scanning
electron microscopy and high resolution scanning electron microscopy.
Energy dispersive spectroscopy was employed to confirm the weight
percentages of elements present in the composites. Transmission electron
microscopic analysis was performed to observe morphological changes in
the composites. X-ray diffraction analysis was carried out to confirm the
phases of developed reinforcement and composites. A universal testing
machine was employed for the observation of mechanical properties, viz.
flexural strength, Young’s modulus and diametral compressive strength,
and it was found that the mechanical strength improved by 50-55% in the
case of 10 vol% SiO2 coated Al-ABOw composite. The effect of SiO2 coating
on the hardness of fabricated composite was also evaluated and the
maximum microhardness value was observed to be 46.2 HV in 10 vol% SiO2
coated composite. Themicrostructural analysis showed that excellent grain
refined structures with improved mechanical strength were obtained.
[Keywords: SiO2 coating, Powder metallurgy, Flexural strength, DCS, HRSEM,
TEM and Fractography] |
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