The objective of the study is to understand the evolution of structure during annealing of a cryogenically rolled medium entropy alloy and compare the annealing behavior with a high entropy alloy. The understanding of annealing kinetics is important to optimize the mechanical properties. Cryogenically rolled medium entropy alloy (CoCrNi) was annealed in the temperature range of 600–850 °C. Recrystallization occurred at a temperature of 600 °C, which is about 200 °C lower than the temperature required to induce recrystallization in the CoCrFeMnNi high entropy alloy at identical cryogenically rolling reduction of ~30%. High fraction of annealing twins was observed with fraction in the range of ~53–59%. The geometrically necessary dislocation density for the annealed alloy was ~1 × 1014 m−2. The study underscores that the annealing temperature depends on the number and nature of constituent elements in the alloy. A high annealing temperature is conducive to the formation of annealing twins when the unstable deformed microstructure transforms into a new equilibrium and recrystallized structure.
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On the Effect of Annealing on Cryogenically Rolled Medium Entropy Alloy
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Received: 22 Nov 2025 | Revised: 15 Dec 2025 | Accepted: 19 Dec 2025 | Published: 23 Dec 2025
Abstract
Keywords
medium entropy alloy | annealing | recyrstallization | microstructure
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