High entropy alloy (HEA)-based alloy design is experiencing a conceptual broadening from equiatomic alloys to non-equiatomic alloys. To provide experimental basis for designing Cu-rich non-equiatomic HEAs, in the current study, a dual phase (Cu-rich and CoCrFeNi-rich phases) face-centered cubic CoCrFeNiCu₄ alloy was systematically investigated. We provided initial and experiment-based understanding of the behavioral change of the alloy during a variety of thermal cycles and thermomechanical processing. The current results indicate that, during heating, preferred precipitation of Cu-rich particles occurs, leading to more pronounced compositional differences between the two constituent FCC phases and increased relative volume fraction of the Cu-rich phase. The Alloy exhibits a continuous melting and discontinuous solidification of the Cu-rich and CoCrFeNi-rich phases. After being cold-rolled to ∼ 90 % thickness reduction, the alloy exhibits a recrystallization temperature higher than 800 °C. Annealing at 300 and 500 °C led to strength reduction and/or ductility decrease; further increasing annealing temperature monotonically caused softening and ductilization due to decreased density of pre-existing dislocations. The yield-drop phenomena observed for the 900 °C- and 1000 °C-annealed specimens are associated with the locking of pre-existing dislocations by some “atmosphere”, the nature of which warrants further elucidation.

基于高熵合金（HEA）的合金设计正在经历从等原子合金到非等原子合金的概念扩展。为设计富铜非等原子HEA提供实验依据，在当前研究中，采用了双相（富铜和富CoCrFeNi的相）面心立方CoCrFeNiCu ₄对合金进行了系统的研究。我们对各种热循环和热机械加工过程中合金的行为变化提供了初步的和基于实验的理解。当前的结果表明，在加热期间，发生富铜颗粒的优选沉淀，导致两个组成的FCC相之间的成分差异更加明显，并且富铜相的相对体积分数增加。合金表现出富铜相和富钴铬铁镍相的连续熔化和不连续凝固。冷轧至约90％的厚度减小后，合金的重结晶温度高于800°C。在300和500°C下退火会导致强度降低和/或延展性降低；进一步升高的退火温度由于降低了先前存在的位错的密度而单调引起软化和渗碳。在900°C和1000°C退火的样品上观察到的屈服降落现象与某些“大气层”对先前存在的位错的锁定有关，其性质值得进一步阐明。