Lee Che-Fu, Shun Tao-Tsung
Department of Materials Science and Engineering, Feng Chia University, Taichung 407, Taiwan.
Materials (Basel). 2021 May 19;14(10):2665. doi: 10.3390/ma14102665.
In this study, effects of the replacement of Co with Ni on the microstructure, mechanical properties, and age hardening of high-entropy alloys of AlCoCrFeNi (x = molar ratio; x = 0, 0.5, 1, denoted as X, X, and X, respectively) were investigated. These three alloys exhibited a dendritic structure comprising an ordered BCC matrix, a BCC phase, and an FCC or an ordered FCC phase. From X to X alloys, the yield stress and compressive stress decreased from 1202 and 1790 MPa to 693 and 1537 MPa, respectively. However, fracture strain increased from 0.15 to 0.42. Peak age hardening at 600 °C for the X alloy was due to the precipitation of the (Cr,Fe)-rich σ phase. Peak age hardening for the X and X alloys was observed at 500 °C because of the precipitation of the σ phase and BCC phase, respectively.
在本研究中，研究了用镍替代钴对AlCoCrFeNi高熵合金（x =摩尔比；x = 0、0.5、1，分别表示为X、X和X）的微观结构、力学性能和时效硬化的影响。这三种合金呈现出一种枝晶结构，由有序的体心立方（BCC）基体、一个BCC相以及一个面心立方（FCC）或有序FCC相组成。从X合金到X合金，屈服应力和压缩应力分别从1202和1790兆帕下降到693和1537兆帕。然而，断裂应变从0.15增加到了0.4。X合金在600℃时的时效硬化峰值是由于富（Cr，Fe）的σ相析出。X和X合金的时效硬化峰值分别在500℃时观察到，这分别是由于σ相和BCC相的析出。
