Yi Hailong, Bi Mengyuan, Yang Kang, Zhang Bing
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
Materials (Basel). 2020 Oct 31;13(21):4909. doi: 10.3390/ma13214909.
In this work, SiCoCrNi (x = 0, 0.1, 0.2, 0.3, 0.4, molar ratio) alloys were designed by introducing elemental Si into CoCrNi, a medium-entropy alloy (MEA). The effects of Si addition on the microstructure and mechanical properties of the as-cast SiCoCrNi alloys were investigated. The results suggested that a novel Si-rich face-centred cubic (FCC) phase formed in the SiCoCrNi and SiCoCrNi alloys. The Si-rich FCC phase, which featured high hardness and was located between the dendrites of the matrix FCC phase (with higher phase fraction), significantly increased the yield strength of the SiCoCrNi alloys five times compared with the CoCrNi alloy.
在本研究中，通过向中熵合金（MEA）CoCrNi中引入元素Si，设计了SiCoCrNi（x = 0、0.1、0.2、0.3、0.4，摩尔比）合金。研究了添加Si对铸态SiCoCrNi合金微观结构和力学性能的影响。结果表明，在SiCoCrNi和SiCoCrNi合金中形成了一种新型的富Si面心立方（FCC）相。这种富Si的FCC相具有高硬度，位于基体FCC相（具有较高的相分数）的枝晶之间，与CoCrNi合金相比，显著提高了SiCoCrNi合金的屈服强度五倍。
