Understanding of the competition between continuous precipitation (CP) and discontinuous precipitation (DP) is crucial for tailoring the microstructure and mechanical properties of precipitation-strengthened high-entropy alloys (HEAs). In this study, the effects of aging temperature, aging time, and grain size on the CP and DP behaviors of L1₂-strengthened HEAs were systematically investigated. Our results reveal that low temperatures favor the DP reaction while high temperatures facilitate the CP reaction, which is related to the nucleation site and diffusion path of the two precipitation modes. At intermediate temperatures, both the CP and DP occur simultaneously and compete with each other, and the solute concentration difference across the boundaries between the two precipitation regions serves as the driving force for the sweeping of the CP regions by the DP reaction. In addition, grain size refinement can promote the DP reaction by providing more nucleation sites and more fast diffusion paths, leading to the formation of the DP-dominant microstructure. This study not only sheds light on the fundamental understanding of the CP and DP mechanisms but also provides useful guidelines for the microstructure design of advanced L1₂-strengthened HEAs.

了解连续沉淀 (CP) 和不连续沉淀 (DP) 之间的竞争对于调整沉淀强化高熵合金 (HEA) 的微观结构和机械性能至关重要。在本研究中，时效温度、时效时间和晶粒尺寸对 L1 _{2 CP 和 DP 行为的影响}- 系统地研究了强化的 HEA。我们的研究结果表明，低温有利于DP反应，而高温有利于CP反应，这与两种沉淀模式的成核位置和扩散路径有关。在中间温度下，CP和DP同时发生并相互竞争，两个沉淀区边界上的溶质浓度差是DP反应席卷CP区的驱动力。此外，晶粒尺寸细化可以通过提供更多的成核位点和更快的扩散路径来促进 DP 反应，从而形成以 DP 为主的微观结构。₂ - 强化 HEA。