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HomeKey Engineering MaterialsKey Engineering Materials Vol. 882Corrosion Behaviour of In Situ AlxNiy Reinforced...

Corrosion Behaviour of In Situ Al_xNi_y Reinforced AA6061 Composite

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Abstract:

In-situ Al_xNi_y reinforced aluminium matrix composites (AMCs) were produced by stir-casting route by adding 5, 10 and 15 weight percentage (wt.%) of Ni to AA6061 aluminum alloy. The density, porosity, microstructure, hardness and corrosion behaviour of the as-cast AMCs was studied and compared with that of the as-cast AA6061 alloy. The porosity in all the castings was found to be less than 0.1%. Further, the porosity was found to decrease with increase in Ni addition. Optical microscopy studies showed that in-situ formed Al_xNi_y was distributed along the dendritic arms. The distribution became non-homogeneous and coarse with increase in Al_xNi_y content. The coarse distribution of Al_xNi_y in the AA6061 matrix also resulted in the decrease in hardness of the composite, after an initial increase in hardness till 10 wt.% Ni addition. The open circuit potential (OCP) and corrosion potential (E_corr) of the AMCs with 5, 10 and 15 wt. of % Ni addition was noble than that of the AA6061 alloy. This was understood to be due to the presence of Al_xNi_y intermetallic which is known to have a noble corrosion potential than the aluminium alloy. However, the corrosion current (i_corr) increased while the polarization resistance (R_p) decreased with increase in Ni addition in the AMC. This indicates that the coarse non-homogeneous distribution of in-situ Al_xNi_y had a detrimental effect on the corrosion performance of the AMCs.

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Advances in Material Science

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Periodical:

Key Engineering Materials (Volume 882)

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96-103

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.882.96

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Online since:

April 2021

Authors:

A.D. Vishwanatha, D.M. Shivanna, Bijayani Panda*

Keywords:

AA6061, AMC, Density, Hardness, Microscopy, Porosity, Potentiodyanamic Polarization, Stir-Casting

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