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Materials-structure-property correlation study of spark plasma sintered AlCuCrFeMnWx (x = 0, 0.05, 0.1, 0.5) high-entropy alloys

Published online by Cambridge University Press:  04 March 2019

Devesh Kumar ,
Vishnu K. Sharma ,
Y.V.S.S. Prasad  and
Vinod Kumar Open the ORCID record for Vinod Kumar [Opens in a new window]
Devesh Kumar
Affiliation:
Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology (MNIT)Jaipur, 302017, India Department of Mechanical Engineering Jaipur Engineering College and Research Centre (JECRC), Jaipur 302017, India
Vishnu K. Sharma
Affiliation:
Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology (MNIT)Jaipur, 302017, India
Y.V.S.S. Prasad
Affiliation:
Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology (MNIT)Jaipur, 302017, India
Vinod Kumar*
Affiliation:
Discipline of Metallurgy and Materials Science, Indian Institute of Technology (IIT)Indore, 453552, India
*
a)Address all correspondence to this author. e-mail: vk.iitk@gmail.com
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Abstract

A novel series of nanocrystalline AlCuCrFeMnWx (x = 0, 0.05, 0.1, 0.5) high-entropy alloys (HEAs) were synthesized by mechanical alloying followed by spark plasma sintering. The phase evolution of the current HEAs was studied using X-ray diffraction (XRD), transmission electron microscopy, and selected area electron diffraction. The XRD of the AlCuCrFeMn sintered HEA shows evolution of ordered B2 phase (AlFe type), sigma phase (Cr rich), and FeMn phase. AlCuCrFeMnWx (x = 0.05, 0.1, 0.5 mol) shows formation of ordered B2 phases, sigma phases, FeMn phases, and BCC phases. Micro-hardness of the AlCuCrFeMnWx samples was measured by Vickers microindentation and the maximum value observed is 780 ± 12 HV. As the tungsten content increases, the fracture strength under compression increases from 1010 to 1510 MPa. Thermodynamic parameters of present alloys confirm the crystalline phase formation, and finally structure–property relationship was proposed by conventional strengthening mechanisms.

Keywords

nanocrystallinediffractionhigh-entropy alloy
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. 767 - 776
Copyright
Copyright © Materials Research Society 2019 

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