An investigation on the hardness and corrosion behavior of MWCNT/Mg composites and grain refined Mg
N. Saikrishna (Rajiv Gandhi University of Knowledge Technologies (AP-IIIT), Bhabha Atomic Research Centre)
G. Pradeep Kumar Reddy (Vignana Bharathi Institute of Technology)
Balakrishnan Munirathinam (TU Delft - (OLD) MSE-6, Indian Institute of Technology Madras)
Ravikumar Dumpala (Visvesvaraya National Institute of Technology (VNIT))
M. Jagannatham (Bhabha Atomic Research Centre)
B. Ratna Sunil (Rajiv Gandhi University of Knowledge Technologies (AP-IIIT))
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Abstract
In the present work, multi walled carbon nanotubes (MWCNT) reinforced magnesium (Mg) matrix composite was fabricated by friction stir processing (FSP) with an aim to explore its mechanical and electrochemical behavior. Microstructural observations showed that the thickness of the produced composite layer was in the range of 2500 μm. FSP resulted uniform distribution of CNT near the surface while agglomerated layers in the subsurface. Grain refinement of Mg achieved by FSP improved the hardness but significant enhancement in the hardness value was observed for FSPed MWCNT/Mg composites. Potentiodynamic polarization studies revealed that the increase in corrosion current density was observed for MWCNT/Mg composite compared with grain refined Mg and pure Mg, implying the significance of secondary phase (MWCNT) in decreasing the corrosion resistance of the composite.
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