High-entropy alloys are a new class of multi-component alloys, which demonstrate outstanding strength-ductility combination, significant expanding the alloy design space in metallurgical research. However, the yield strength levels, are still low when compared with other high strength materials. Here, the non-equiatomic design concept was employed to improve the yield strength of the CoFeNi alloy through adjusting the Al and Ti element. Gigapascal compressive yield strength and relative good ductility were obtained in the FCC + L1₂+BCC structured high-entropy alloys system. In addition, the superiority of adding Al and Ti simultaneously in micro-mechanical behaviors was investigated during nano-indentation tests at room temperature. The strength increment is owing to various complementary strengthening mechanisms, including solid solution strengthening, Hall-Petch strengthening, and precipitation strengthening, which have been quantitatively calculated.

高熵合金是一类新型的多组分合金，具有出色的强度-延展性组合，极大地扩展了冶金研究中的合金设计空间。但是，与其他高强度材料相比，屈服强度水平仍然很低。此处，采用非等原子设计概念通过调整Al和Ti元素来提高CoFeNi合金的屈服强度。在FCC + L1 ₂中获得了Gigaapascal的压缩屈服强度和相对较好的延展性+ BCC结构的高熵合金体系。此外，在室温下的纳米压痕测试过程中，研究了在微观力学行为中同时添加Al和Ti的优越性。强度增加归因于各种互补的强化机制，包括固溶强化，Hall-Petch强化和沉淀强化，它们已经进行了定量计算。