Microstructure and texture evolution during annealing of equiatomic CoCrFeMnNi high-entropy alloy

Bhattacharjee, P P and Sathiaraj, G D and Zaid, M and Gatti, J R and Lee, C and Tsai, C W and Yeh, J W (2014) Microstructure and texture evolution during annealing of equiatomic CoCrFeMnNi high-entropy alloy. Journal of Alloys and Compounds, 587. pp. 544-552. ISSN 0925-8388

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Abstract

Evolution of microstructure and texture after heavy cold rolling and subsequent annealing in a wide temperature range was first studied in an FCC equiatomic CoCrFeMnNi high-entropy alloy (HEA). Development of a submicron-cell structure and a strong brass-type texture was observed after 90% cold rolling. An ultrafine microstructure having average recrystallized grain size ∼1 μm with profuse annealing twins was observed after annealing at 650 °C. Remarkable resistance against grain coarsening was observed at least up to 800 °C. The mechanisms for these features were closely related with the distinct whole-solute matrix in HEAs. The recrystallization texture was characterized by the retention of deformation texture components similar to those of TWIP and 316 stainless steels. But notable differences exist. The S ({1 2 3}〈6 3 4〉) component is stronger than brass ({1 1 0}〈1 1 2〉) and Goss ({1 1 0}〈0 0 1〉), and strengthened with increasing annealing temperatures. Strong α-fiber (〈1 1 0〉//ND) components other than the deformation components BS and G, and higher fraction of random components also develop. It could be attributed to profuse annealing twin formation due to the low stacking fault energy of the alloy

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