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Room temperature wear study of Al0.4FeCrNiCox (x = 0, 0.25, 0.5, 1.0 mol) high-entropy alloys under oil lubricating conditions

Published online by Cambridge University Press:  06 February 2019

Saurav Kumar ,
Amar Patnaik ,
Ajaya Kumar Pradhan  and
Vinod Kumar Open the ORCID record for Vinod Kumar [Opens in a new window]
Saurav Kumar
Affiliation:
Department of Metallurgical and Materials Engineering, MNIT, Jaipur 302017, India
Amar Patnaik*
Affiliation:
Department of Mechanical Engineering, MNIT, Jaipur 302017, India
Ajaya Kumar Pradhan
Affiliation:
Department of Metallurgical and Materials Engineering, MNIT, Jaipur 302017, India
Vinod Kumar*
Affiliation:
Discipline of Metallurgy Engineering and Materials Science, IIT, Indore 453552, India
*
a)Address all correspondence to these authors. e-mail: apatnaik@mnit.ac.in
b)e-mail: vkt@iiti.ac.in
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Abstract

This study aims to investigate the sliding wear behavior of Al0.4FeCrNiCox (x = 0, 0.25, 0.5, 1.0 mol) high-entropy alloys (HEAs) under oil lubricating conditions at room temperature. Phase and microstructural characterizations of HEAs are performed by utilizing X-ray photoelectron spectroscopy (XRD) and scanning electron microscope (SEM). The compressive yield strength of Al0.4FeCrNiCox (x = 0, 0.25, 0.5, 1.0 mol) HEAs is observed to decrease from 1169.35 to 257.63 MPa. Plastic deformation up to 75% is achieved in the case of Al0.4FeCrNiCox=1 HEA. The microhardness of HEA samples is found to decrease from 377 to 199 HV after the addition of cobalt content from x = 0 to 1.0 mol. Thermal analysis is performed using a differential scanning calorimeter. It is confirmed that Al0.4FeCrNiCox (x = 0, 0.25, 0.5, 1.0 mol) HEAs do not undergo any phase change up to 1000 °C. The specific wear rate of Al0.4FeCrNiCox=1 HEA is observed to be highest in all wear conditions. The worn surfaces were analyzed by SEM with attached energy-dispersive spectroscopy, 3D profiling, and X-ray photoelectron spectroscopy (XPS).

Keywords

high-entropy alloymicrohardnesswear
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 5: Focus Issue: Nanocrystalline High Entropy Materials: Processing Challenges and Properties , 14 March 2019 , pp. 841 - 853
Copyright
Copyright © Materials Research Society 2019 

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