CoCrNi -medium-entropy alloy (MEA) has been widely investigated due to its superior mechanical properties that overcome strength-ductility tradeoff. Here we show further property enhancement of CoCrNi MEA by introducing nano-scale features. Both CoCrNi and oxide dispersion strengthened (ODS) CoCrNi are fabricated by mechanical alloying and spark plasma sintering. Microstructural characterization and mechanical testing of these nanostructured MEAs revealed that the nano-scale features significantly improves the strength of the alloys. In ODS-CoCrNi MEA, Y₂Ti₂O₇ oxides with an average diameter of 7.3 ± 3.2 nm are incoherent with the matrix, and a specific orientation relationship exists between Y₂Ti₂O₇ and the matrix, which is [011]_Y2Ti2O7//[011]_Matrix, (400)_Y2Ti2O7//(200)_Matrix and (22$\bar{2}$)_Y2Ti2O7//(11$\bar{1}$)_Matrix. The recrystallization and grain growth processes are effectively suppressed by the introduction of Y₂Ti₂O₇ nanoparticles. Strengthening mechanism analyses indicate that the strength improvement of ODS-CoCrNi is mainly ascribed to the precipitation strengthening of Y₂Ti₂O₇

CoCrNi-中熵合金（MEA）由于其优越的机械性能克服了强度-延展性的折衷而受到广泛研究。在这里，我们展示了通过引入纳米级特征进一步增强了CoCrNi MEA的性能。CoCrNi和氧化物弥散强化（ODS）CoCrNi都是通过机械合金化和火花等离子体烧结制造的。这些纳米结构MEA的微结构表征和力学测试表明，纳米尺度的特征显着提高了合金的强度。在ODS-CoCrNi MEA中，平均直径为7.3±3.2 nm的Y ₂ Ti ₂ O ₇氧化物与基体不相干，并且Y ₂ Ti ₂ O之间存在特定的取向关系。₇和矩阵，即[011] _Y2Ti2O7 /// [011]_矩阵，（400）_Y2Ti2O7 //（200）_矩阵和（22$\stackrel{〜}{\mathrm{2个}}$）_Y2Ti2O7 //（11$\stackrel{〜}{\mathrm{1个}}$）_矩阵。通过引入Y ₂ Ti ₂ O ₇纳米颗粒，有效抑制了再结晶和晶粒生长过程。强化机理分析表明，ODS-CoCrNi的强度提高主要归因于Y ₂ Ti ₂ O ₇的析出强化。