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Influence of processing route on the alloying behavior, microstructural evolution and thermal stability of CrMoNbTiW refractory high-entropy alloy

Published online by Cambridge University Press:  05 June 2020

Lavanya Raman Open the ORCID record for Lavanya Raman [Opens in a new window] ,
G. Karthick ,
K. Guruvidyathri ,
Daniel Fabijanic ,
S. V. S. Narayana Murty ,
B. S. Murty Open the ORCID record for B. S. Murty [Opens in a new window]  and
Ravi S. Kottada
Lavanya Raman*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai600036, India
G. Karthick
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai600036, India
K. Guruvidyathri
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai600036, India
Daniel Fabijanic
Affiliation:
Institute for Frontier Materials, Deakin University, Geelong, VIC3220, Australia
S. V. S. Narayana Murty
Affiliation:
Materials and Metallurgy Group, Vikram Sarabhai Space Center, Trivandrum695022, India
B. S. Murty*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai600036, India
Ravi S. Kottada*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai600036, India
*
a)Address all correspondence to these authors. e-mail: lavanya.metly@gmail.com
b)e-mail: murty@iitm.ac.in; murty.iitm@gmail.com
c)e-mail: ravi.sankar@iitm.ac.in; raviskottada@gmail.com
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Abstract

Two different processing routes of mechanical alloying followed by the spark plasma sintering (powder metallurgy) and vacuum arc melting (casting route) were employed to understand the role of processing routes on the phase and microstructural evolution in an equiatomic CrMoNbTiW refractory high-entropy alloy. Besides a major BCC solid solution, a small fraction of carbide, σ phase, nitride, and oxide phases were observed in the alloys prepared by the powder metallurgy route in contrast to a single-phase BCC solid solution in the casting route. The milling atmosphere (dry milling in air and Ar) has significantly influenced the phase and microstructural evolution, illustrating the substantial role of contaminants. Good thermal stability of microstructure at high homologous temperatures was shown based on the long-term heat treatment at 1300 °C for 240 h. The phase evolution predictions via Calphad studies were found to be in reasonable agreement with the experimental observations, albeit with some limitations.

Type
Novel Synthesis and Processing of Metals
Information
Journal of Materials Research , Volume 35 , Issue 12 , 29 June 2020 , pp. 1556 - 1571
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Copyright
Copyright © Materials Research Society 2020

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