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Tribological and corrosion properties of AM70 magnesium alloy processed by equal channel angular pressing

Published online by Cambridge University Press:  08 May 2017

Karekere Rangaraju Gopi  and
Hanumanthappa Shivananda Nayaka
Karekere Rangaraju Gopi*
Affiliation:
Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal 575025, India
Hanumanthappa Shivananda Nayaka
Affiliation:
Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal 575025, India
*
a) Address all correspondence to this author. e-mail: nitkgopi@gmail.com
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Abstract

Wear and corrosion properties of AM70 magnesium alloy subjected to equal channel angular pressing (ECAP) were investigated using pin-on-disc dry sliding wear test and electrochemical impedance spectroscopy (EIS), respectively. Wear test was conducted with 30 and 40 N loads with sliding distance of 5000 m and at a constant speed of 3 m/s. Reduced coefficient of friction (COF) and wear mass loss of ECAP processed samples showed increased wear resistance. Worn surface analysis by scanning electron microscope (SEM) showed the presence of delamination, wear debris, and plowing. Energy dispersive X-ray spectrometer (EDS) revealed the occurrence of oxidation, and the wear mechanism was identified as abrasion and oxidation wear. EIS plots showed the improvement in corrosion resistance of ECAP processed magnesium alloy compared to initial condition due to grain refinement and homogeneous distribution of secondary particles.

Keywords

equal channel angular pressingAM70 alloycoefficient of frictionelectrochemical impedance spectroscopyenergy dispersive X-ray spectrometerX-ray diffraction

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Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 11 , 14 June 2017 , pp. 2153 - 2160
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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