In this study, the microstructural evolution and strengthening mechanism of deformation-processed CoCrFeCuNi and CoCrFeCu_1.71Ni were studied. Segregation and phase separation into dual fcc phases was found to be thermodynamically stable even after homogenizing annealing at 1273K. Dual fcc phase structure with elongated Cu-rich filaments developed by deformation processing and elongated dual-phase structure was found to remain stable even during annealing at1173 K. The high temperature stability of Cu-rich filaments is attributed to the low internal strain energy of filaments due to continuous recrystallization during deformation processing. One interesting consequence of stability of Cu-rich filaments is that the phase boundaries act as barriers to grain growth and the grain of Cr–Fe–Co–Ni matrix and Cu-rich filaments are controlled by the distribution and thickness of Cu-rich phase. The yield strengths of CoCrFeCuNi (506 MPa) and CoCrFeCu_1.71Ni (477Mpa) were observed to be greater than that of the original Cantor alloy (220 MPa) with minor reduction of elongation less than 3–7%. Phase boundaries in CoCrFeCuNi or CoCrFeCu_1.71Ni HEAs act as effective barriers to grain growth during annealing and to dislocation transmission during deformation. The strengthening with excellent ductility in HEAs of this study is attributed to the grain size refinement and the development of the enhanced back stress by the phase boundaries between Cu-rich filaments and Cu-lean matrix with higher modulus and strength. The lower strength of annealed CoCrFeCu_1.71Ni than that of CoCrFeCuNi can be attributed to the presence of higher fraction of soft Cu-rich filaments.

本研究研究了变形处理后的CoCrFeCuNi和CoCrFeCu _{1.71的组织}演变和强化机理。对镍进行了研究。发现即使在1273K下进行均质退火后，分离和分离成双FCC相也是热力学稳定的。发现通过变形处理形成的具有富铜长丝的双fcc相结构和细长的双相结构甚至在1173 K退火期间也保持稳定。富铜丝的高温稳定性归因于灯丝的低内部应变能由于在变形过程中连续重结晶。富铜丝的稳定性的一个有趣的结果是，相边界成为晶粒生长的障碍，而铬-铁-钴-镍基体和富铜丝的晶粒由富铜相的分布和厚度控制。CoCrFeCuNi（506 MPa）和CoCrFeCu _1.71的屈服强度观察到镍（477Mpa）大于原始的Cantor合金（220 MPa），而伸长率的小幅降低小于3–7％。CoCrFeCuNi或CoCrFeCu _1.71 Ni HEA中的相界是退火过程中晶粒生长和变形过程中位错传递的有效屏障。这项研究中的HEA具有出色的延展性，这是由于晶粒细化和富铜丝与具有较高模量和强度的贫铜基体之间的相界增强了背应力而产生的。退火后的CoCrFeCu _1.71 Ni的强度低于CoCrFeCuNi的强度，这可以归因于存在较高含量的富软铜丝。