The L1₂ nanoparticles-enhanced alloys have huge potential in high temperature applications. In this study, the effects of Cr content on precipitation behaviors of (CoCrNi)₉₄Ti₃Al₃ medium entropy alloys are investigated. The results indicate the fraction of L1₂ phase increases with the rising Cr content, meanwhile, the size and coarsening rate of L1₂ phase decrease, which suppresses the overaged degradation of hardness. The Cr concentration gradient between L1₂ phase and FCC phase plays an important role in the coarsening process. It is instructive to obtain exceptional nanostructure stability of L1₂ phase in precipitation-strengthened high entropy alloys via compositional optimization of base elements.

L1 ₂纳米颗粒增强合金在高温应用中具有巨大潜力。在这项研究中，研究了Cr含量对（CoCrNi）₉₄ Ti ₃ Al ₃中等熵合金的析出行为的影响。结果表明，随着Cr含量的增加，L1 ₂相的分数增加，同时，L1 ₂相的尺寸和粗化速率减小，从而抑制了硬度的过时降低。L1 ₂相和FCC相之间的Cr浓度梯度在粗化过程中起重要作用。获得L1 ₂优异的纳米结构稳定性是有益的 沉淀强化的高熵合金的基本相组成通过基础元素的组成优化。