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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Electrochemical and Tribological Behaviour of Ti6Al4V Subjected to the Duplex SMAT/Plasma Nitriding
Author(s)
Jelliti Sami1, 2 and Delphine Retraint2
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DOI:10.17265/2159-5348/2018.03.004
Affiliation(s)
1. Innovation and Entrepreneurship Center, Jazan University, Jazan 82612, Saudi Arabia
2. The Laboratory of Mechanical Systems and Concurrent Engineering (LASMIS), University of Technology of Troyes, Troyes 10300, France
ABSTRACT
In this work, SMAT (surface
mechanical attrition treatment) was performed on Ti6Al4V. Plasma nitriding of
the SMATed samples was investigated in comparison with coarse-grained samples.
The samples were characterized using optic microscope, SEM, TEM and Vickers
microhardness tester. The results showed that a significantly thicker compound
layer with higher hardness was obtained for the SMATed samples when compared
with un-SMATed samples after nitriding. Corrosion resistance of Ti6Al4V in a
Ringer’s solution was studied by electrochemical techniques including open
circuit potential measurement, potentiodynamic polarization and EIS (electrochemical
impedance spectroscopy). Overall, our results identified the beneficial impacts
of the duplex SMAT/nitriding treatment on corrosion behaviour of Ti6Al4V. Wear
tests were also performed on a ball-on-disc tribometer where the treated
samples were rubbed against a 6 mm diameter alumina ball under a normal load of
5 N using Ringer’s solution as lubricant media. The friction coefficient of the
SMATed and nitrided samples was reduced compared to the untreated samples. Wear
rates demonstrated that SMAT combined with nitriding improved wear resistance
of Ti6Al4V alloy.
KEYWORDS
Surface mechanical attrition treatment, plasma nitriding, corrosion, wear, Ti6Al4V.
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