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Effect of niobium addition in FeCoNiCuNbx high-entropy alloys

Published online by Cambridge University Press:  04 March 2019

Rahul M.R. ,
Sumanta Samal  and
Gandham Phanikumar Open the ORCID record for Gandham Phanikumar [Opens in a new window]
Rahul M.R.
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
Sumanta Samal
Affiliation:
Discipline of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Indore, Madhya Pradesh 453552, India
Gandham Phanikumar*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
*
a)Address all correspondence to this author. e-mail: gphani@iitm.ac.in
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Abstract

In the design of high-entropy alloys (HEAs) with desired properties, identifying the effects of elements plays an important role. HEAs with eutectic microstructure can be obtained by judiciously modifying the alloy compositions. In this study, the effect of Nb addition to FeCoNiCuNbx (x = 0.5, 5, 7.5, 11.6, 15) alloys was studied by varying the Nb concentration (at.%). FeCoNiCuNb0.5 HEA shows liquid phase separation to form Cu-rich and FeCoNiCu-rich phases. Detailed solidification paths are proposed for these alloys, which show eutectic, peritectic, and pseudo quasi-peritectic reactions. Increasing Nb content promotes the liquid phase separation tendency and causes the formation of Cu-rich spheres. The effect of Nb on the FeCoNiCu-rich phase was studied based on the nanoindentation and correlated with nanohardness. The compressive deformation properties of these alloys are studied at room temperature and high temperature and correlated with microstructure. Fractography results show the mode of fracture and are correlated with the microstructure obtained.

Keywords

eutectic high-entropy alloy (EHEA)nanoindentationflow stressphase separation
Type
Invited Paper
Information
Journal of Materials Research , Volume 34 , Issue 5: Focus Issue: Nanocrystalline High Entropy Materials: Processing Challenges and Properties , 14 March 2019 , pp. 700 - 708
Copyright
Copyright © Materials Research Society 2019 

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