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First report on entire sets of experimentally determined interdiffusion coefficients in quaternary and quinary high-entropy alloys

Published online by Cambridge University Press:  09 January 2020

Vivek Verma ,
Aparna Tripathi ,
Thiruvenkatam Venkateswaran  and
Kaustubh N. Kulkarni Open the ORCID record for Kaustubh N. Kulkarni [Opens in a new window]
Vivek Verma
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208016, India
Aparna Tripathi
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208016, India
Thiruvenkatam Venkateswaran
Affiliation:
Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Trivandrum, Kerala 695022, India
Kaustubh N. Kulkarni*
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208016, India
*
a)Address all correspondence to this author. e-mail: kkaustub@iitk.ac.in
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Abstract

For the first time in the literature, experimental determination of entire sets of exact interdiffusion coefficients in quaternary and quinary alloy systems is reported. Using the method of body-diagonal diffusion couple, a set of nine quaternary interdiffusion coefficients were evaluated in Fe–Ni–Co–Cr and a set of sixteen quinary interdiffusion coefficients were determined in a Fe–Ni–Co–Cr–Mn system, both at approximately equimolar compositions. Regions of uphill interdiffusion and zero flux planes were observed for nickel and cobalt in quinary couples, indicating the existence of strong diffusional interactions in Fe–Ni–Co–Cr–Mn alloys. The strong diffusional interactions were also manifested in the large magnitudes of cross coefficients in both the systems. The existence of strong diffusional interactions in high-entropy alloys (HEAs) as observed through experimentally determined interdiffusion coefficients in this study establishes beyond doubt the fact that cross interdiffusion coefficients cannot be ignored in HEAs.

Keywords

diffusionquaternaryquinarydiffusional interactionhigh-entropy alloy
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 2 , 28 January 2020 , pp. 162 - 171
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Copyright
Copyright © Materials Research Society 2020

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