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Phase evolution of refractory high-entropy alloy CrMoNbTiW during mechanical alloying and spark plasma sintering

Published online by Cambridge University Press:  22 January 2019

Lavanya Raman Open the ORCID record for Lavanya Raman [Opens in a new window] ,
K. Guruvidyathri ,
Geeta Kumari ,
S.V.S. Narayana Murty ,
Ravi Sankar Kottada  and
B.S. Murty Open the ORCID record for B.S. Murty [Opens in a new window]
Lavanya Raman*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
K. Guruvidyathri
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India; High Entropy Materials Center, Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
Geeta Kumari
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
S.V.S. Narayana Murty
Affiliation:
Materials and Metallurgy Group, Vikram Sarabhai Space Center, Trivandrum 695022, India
Ravi Sankar Kottada*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
B.S. Murty*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
*
a)Address all correspondence to these authors. e-mail: lavanya.metly@gmail.com
b)e-mail: ravi.sankar@iitm.ac.in
c)e-mail: murty@iitm.ac.in
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Abstract

In the present study, the phase evolution and microstructure of CrMoNbTiW, a new equi-atomic refractory high-entropy alloy, are studied. The alloy was synthesized through mechanical alloying (MA) followed by consolidation using spark plasma sintering. After MA, a major BCC solid solution along with residual Cr and Nb were observed. However, secondary phases such as Laves and carbides were also observed in addition to the major BCC solid solution after sintering. Unsolicited contamination from the milling media is found to be one of the reasons for the formation of secondary phases. The high hardness of 8.9 GPa after sintering was attributed to the presence of secondary phases along with the nanocrystalline nature of the alloy. To understand the phase evolution, calculation of phase diagram was carried out using CALPHAD. Further, binary phase diagram inspection and simple empirical parameters were also used to assess their effectiveness in predicting phases.

Keywords

mechanical alloyingsinteringsecond phases
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. 756 - 766
Copyright
Copyright © Materials Research Society 2019 

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