Abstract
In the present investigation, a newly designed composition of equiatomic AlCrFeCoNiZn high-entropy alloy (HEA) has been synthesized by mechanical alloying. The milled powder after 30 h exhibited the formation of a single solid solution phase of BCC crystal structure with lattice parameter, a = 2.87 ± 0.02 Å. Decomposition of the single-phase BCC structure into the two-phase, tetragonal (Cr–Co)-based σ phase (a = 8.81 Å, c = 4.56 Å)- and L12 (a = 3.59 ± 0.02 Å)-type intermetallics was observed at temperature of ~ 800 °C (1073 K). However, after heat treatment of the 30 h milled powder at the temperatures of 300 °C (573 K) and 600 °C (873 K), similar type of phases was also noticed to coexist along with B2 (a = 2.87 ± 0.03 Å)-type phase. This behaviour of the alloy confirms the diffusive nature of the phase transformation. The consolidated bulk alloy exhibited similar type of phases after sintering at 950 °C (1223 K).
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Acknowledgements
The authors would like to thank Dr. Joysurya Basu, Dr. Manish Kumar Singh, Mr. Vivek Kumar Pandey and Mr. Yagnesh Shadangi for many useful discussions during the course of this investigation.
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Shivam, V., Sanjana, V. & Mukhopadhyay, N.K. Phase Evolution and Thermal Stability of Mechanically Alloyed AlCrFeCoNiZn High-Entropy Alloy. Trans Indian Inst Met 73, 821–830 (2020). https://doi.org/10.1007/s12666-020-01892-1
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DOI: https://doi.org/10.1007/s12666-020-01892-1