Abstract
In recent years, multicomponent alloy systems such as high entropy alloys (HEA) have been synthesized by the conventional alloying strategy where all the elements are mixed in equiatomic or near-equiatomic proportions and processed mostly by mechanical alloying, vacuum arc melting or vacuum induction melting and selective laser melting. In this article, we have explored the possibility of sequential alloying strategy where a binary equiatomic mixture is chosen to start the alloy preparation which is followed by mixing of other elements sequentially in subsequent steps maintaining the equiatomic proportions throughout the process using mechanical alloying and vacuum arc melting. Equiatomic CoCrFeMnNiTi alloy has been synthesized in this study using initial equiatomic Fe and Cr and subsequent addition of Co, Ni, Mn and Ti by mechanical alloying as well as vacuum arc melting. During sequential alloying by mechanical alloying, there is the formation of initially FeCr body-centered cubic (BCC) phase, and by subsequent addition of other elements, the phases evolved were FeCrCo-BCC, FeCrCoNi-face-centered cubic (FCC), FeCrCoNiMn-BCC + FCC and FeCrCoNiMnTi-BCC + FCC. Due to vacuum arc melting, there is a marginal change in the evolved phase when sequential alloying was conducted by the addition of Mn (FeCrCoNiMn) and additional NiTi-rich phase for FeCrCoNiMnTi. Sequential alloying has been proven to be a superior technique for the development of multicomponent alloys as the formation of Laves and R phase may be avoided as was observed in equiatomic multicomponent alloy with similar composition (FeCrMnTi and CoCrFeMn) developed by melting and casting.
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Acknowledgments
The authors would like to thank Central Research Facility (CRF), IIT, Kharagpur, for assistance in carrying out the experimental work. TD would like to thank MHRD, Govt. of India, for financial support. Partial financial grants from Alexander von Humboldt (AvH) (Friedrich Wlhelm Bessel Award), Department of Science and Technology (POWER Fellowship) to JDM and Department of Science and Technology (J. C. Bose Fellowship) to IM are gratefully acknowledged.
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This article is an invited submission to the Journal of Materials Engineering and Performance selected from presentations at the 4th International Conference on Processing & Characterization of Materials (ICPCM 2022) held December 9-11, 2022, at the National Institute of Technology, Rourkela, Odisha, India. It has been expanded from the original presentation. The issue was organized by Prof. Joao Pedro Oliveira, Universidade NOVA de Lisboa, Portugal; Prof. B. Venkata Manoj Kumar, Indian Institute of Technology Roorkee, India; Dr. D. Arvindha Babu, DMRL, DRDO, Hyderabad, India; Prof. Kumud Kant Mehta and Prof. Anshuman Patra, National Institute of Technology Rourkela, Odisha, India and Prof. Manab Mallik, National Institute of Technology Durgapur, India.
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Datta, T., Manna, I. & Majumdar, J.D. Synthesis of Equiatomic CoCrFeMnTiNi Multicomponent Alloy by Sequential Alloying Using Mechanical Alloying and Vacuum Arc Melting. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09193-0
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DOI: https://doi.org/10.1007/s11665-024-09193-0