The CoCrFeNi HEAs offer immense promise for advanced engineering applications. However their strength at high temperatures needs much improvement. In an effort to strengthen the highly ductile matrix, here we report a CoCrFeNi composite in which a continuous network composed of TiN nanograins is placed around the FCC matrix. To accomplish this, initially a CoCrFeNi powder with an in-situ coating of TiN layers was fabricated. Afterwards, the sintering parameters for the designed powders were optimized. At higher sintering temperatures, liquid phase was introduced on the powder interfaces to achieve complete densification. Additionally, prolonged formation of the liquid phase lead to a robust particle-particle adhesion. The liquid infiltration at the interfaces directly influenced the strengthening and toughening of the composite. At optimal sintering conditions, the composite had a density, hardness and flexural strength of 7.49 g/cm³, 450 HV and of 1.78 GPa, respectively.

CoCrFeNi HEA为高级工程应用提供了广阔的前景。但是，它们在高温下的强度需要大大提高。为了增强高度延展性的基体，我们在此报告了一种CoCrFeNi复合材料，其中，由TiN纳米晶粒组成的连续网络放置在FCC基体周围。为此，首先制造了具有原位TiN涂层的CoCrFeNi粉末。然后，对设计粉末的烧结参数进行了优化。在较高的烧结温度下，将液相引入粉末界面以实现完全致密化。另外，液相的延长形成导致牢固的颗粒-颗粒粘附。界面处的液体渗透直接影响复合材料的增强和增韧。³，分别为450 HV和1.78 GPa。