A superior combination of strength-ductility in CoCrFeNiMn high-entropy alloy induced by asymmetric rolling and subsequent annealing treatment

作者：Han, Z. H.^*; Liang, S.; Yang, J.; Wei, R.^*; Zhang, C. J.

来源：Materials Characterization, 2018, 145: 619-626.

DOI：10.1016/j.matchar.2018.09.029

• High entropy alloys
• Mechanical properties
• Asymmetric rolling
• Microstructure gradient

CoCrFeMnNi high-entropy alloy with a smaller average grain size and gradient microstructure was produced by asymmetric rolling (ASR) and subsequent annealing treatment, which gave rise to a superior combination of strength-ductility. High back stress, working hardening and geometrically necessary dislocations were detected in the gradient structure. The ultra-high strength of the CoCrFeMnNi high-entropy alloy was related to the fine grain and high back-stress, while the superior ductility was ascribed to the gradient structure and fine grain. ASR followed by annealing might be a novel strategy for designing high entropy alloys with high performance.

• 出版日期2018-11
• 单位西安理工大学; 郑州大学; 长安大学