AlxCoCrFeNi is one of the most extensively studied high entropy alloy systems, as it has shown excellent mechanical properties suitable for structural applications. In this work, AlxCoCrFeNi(x = 0.3, 0.5, 0.7) alloys were successfully hot-forged without any visible cracks. Contributions from different strengthening mechanisms were estimated and compared with the experiment. Optical microscopy, x-ray diffraction (XRD), electron backscatter diffraction (EBSD), energy dispersive x-ray spectroscopy (EDS) and hardness tests were used for structural and mechanical property analysis. A single-phase face centered cubic (FCC) structured was observed in the as-cast Al_0.3 alloy, whereas, dual-phase FCC and body centered cubic (BCC) structures were observed in the as-cast Al_0.5 and Al_0.7 alloys. An increase in the FCC phase fraction was observed in all the alloy compositions after forging. Microstructure analysis revealed that phase fraction, the formation of twins, low angle grain boundaries, and grain refinement played a vital role in strengthening the alloy systems. After forging, the hardness of the Al_0.3 and Al_0.5 alloys was increased by 22% and 48%, respectively. In contrast, a reduction of 8% in hardness was observed in Al_0.7 alloy. Reduction in the hardness is mainly due to higher FCC phase fraction and interface stress in forged Al_0.7 alloy. A new modified rule of mixture is proposed to estimate the total strength of dual-phase high entropy alloys.

AlxCoCrFeNi是研究最广泛的高熵合金体系之一，因为它具有适合结构应用的优异机械性能。在这项工作中，AlxCoCrFeNi（x = 0.3，0.5，0.7）合金成功进行了热锻，没有任何可见的裂纹。估算了不同强化机制的贡献，并与实验进行了比较。光学显微镜，X射线衍射（XRD），电子背散射衍射（EBSD），能量色散X射线光谱（EDS）和硬度测试用于结构和机械性能分析。在铸态Al _0.3合金中观察到单相面心立方（FCC）结构，而在铸态Al _0.5和Al中观察到双相FCC和体心立方（BCC）结构_0.7合金。在锻造后的所有合金成分中均观察到FCC相分数的增加。显微组织分析表明，相分数，孪晶的形成，低角度晶界和晶粒细化对强化合金体系起着至关重要的作用。锻造后，Al _0.3和Al _0.5合金的硬度分别提高了22％和48％。相反，在Al _0.7合金中观察到硬度降低了8％。硬度降低主要是由于锻造的Al _0.7合金中较高的FCC相分数和界面应力。提出了一种新的混合规则，以估计双相高熵合金的总强度。