NDLI: A Study on Micro-hardness and Tribological Behaviour of Nano-WC–Co–Cr/Multi-walled Carbon Nanotubes Reinforced AZ91D Magnesium Matrix Surface Composites

Content Provider	Springer Nature Link
Author	Bhadouria, Neharika Kumar, Pradeep Thakur, Lalit Dixit, Sudhanshu Arora, Navneet
Copyright Year	2017
Abstract	In the present study, AZ91-D magnesium alloy based metal matrix surface composites (MMSCs) were fabricated by multi-pass friction stir processing (FSP) technique. The nano-WC–Co–Cr and multi-walled carbon nanotubes (MWCNTs) as reinforcements were added by multi-pass FSP using grooving method. The effect of different volume fractions (%) of nano-reinforcements on the micro-structure, micro-hardness and tribological properties of MMSCs were studied. The AZ91-D parent material showed poor micro-hardness and tribological performance which could be attributed to coarse grain microstructure and secondary β-phase distributed on the grain boundaries. On the other hand, friction stir processed material and fabricated MMSCs exhibited improved micro-hardness and tribological properties. This improved performance could be attributed to the homogeneous dispersion of reinforcement particles, dynamically recrystallized ultra-fine structure, and the dissolution of secondary β-phase. Among the different nano-MMSCs reinforced with pure MWCNTs, pure WC–Co–Cr and its hybrid. The WC–Co–Cr/MWCNTs (1:1 ratio) hybrid composite exhibited a maximum average micro-hardness of 118.05 HV, minimum wear rate of 0.45 × 10$^{−3}$ mm$^{3}$/m. But the minimum coefficient of friction (COF) of 0.32 was obtained in case of pure MWCNTs reinforced MMSC. Wear mechanisms like micro-cutting, micro-ploughing, delamination etc. were also evident from the SEM images.
Starting Page	2477
Ending Page	2483
Page Count	7
File Format	PDF
ISSN	09722815
Journal	Transactions of the Indian Institute of Metals
Volume Number	70
Issue Number	9
e-ISSN	09751645
Language	English
Publisher	Springer India
Publisher Date	2017-03-31
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Magnesium Friction stir processing Surface composites Micro-hardness Wear Metallic Materials Materials Science Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Metals and Alloys

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