Influences of recrystallisation and σ phase precipitation on the mechanical properties of CoFeNiMnV high-entropy alloy. (August 2022)

• Record Type: Journal Article
• Authors: Li, Fangjie; Sha, Yeyu; Li, Jiuxiao; Yang, Dongye; Zeng, Xin; Zhou, Xie; Shen, Qin; Liu, Min
• Is Part Of: Materials today communications. Volume 32(2022)
• Publication Date: 2022-08
• Subjects: High-entropy alloy -- Precipitation -- Recrystallisation -- Mechanical property; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.103909
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: An equiatomic CoFeNiMnV high-entropy alloy with a face-centred cubic phase was cast and cold-rolled. The influence of recrystallisation and σ phase precipitation on the mechanical properties of this alloy was explored by varying the annealing temperature from 700 to 1000 °C. The results revealed that V is more effective than Cr at stabilising the σ phase. The precipitation of σ phase occurred before recrystallisation during the annealing process. The σ phase precipitation strengthening and recrystallisation softening had a combined effect on mechanical behaviour. The strength decreased with increasing annealing temperature, resulting from an increased recrystallisation percentage. Moreover, a heterogeneous structure with partial recrystallisation resulted in back stress hardening, and the precipitated σ-phase promoted crack nucleation, resulting in premature fracture. Graphical Abstract: ga1