A series of Al_xCrFe₂Ni₂Mo_0.2 alloy consisting of FCC + BCC phases have been designed, and their as-cast microstructures and mechanical properties were also investigated with x ranging from 0.6 to 0.9. It was found that with the addition of Al element, the solidified structures changed from dendrite to columnar crystal then back to dendrite again. Moreover, the increased amount of BCC phase resulted in finer and more uniform microstructures of FCC [FeCrNi(Mo)] and BCC (Al–Ni) phases. Tensile yield strength and hardness of alloys showed a similar increasing trend as the volume fraction of BCC phase increased. Both strain hardening rate and strain hardening exponent were calculated to assess the tensile properties of the alloys. It was shown that Al_0.6CrFe₂Ni₂Mo_0.2 exhibited the most excellent and comprehensive mechanical properties due to its high work hardening ability and stable strain hardening rate. The product of strength and elongation of Al_0.6CrFe₂Ni₂Mo_0.2 reached up to 38.6 GPa%, which was higher than most of the reported as-cast high-entropy alloys.

中文翻译：

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多组分Al x CrFe 2 Ni 2 Mo 0.2高熵合金的组织与力学性能

设计了一系列由FCC + BCC相组成的Al _x CrFe ₂ Ni ₂ Mo _0.2合金，并利用x研究了它们的铸态组织和力学性能。从0.6到0.9。发现通过添加Al元素，凝固组织从枝晶变为柱状晶体，然后再次回到枝晶。此外，增加的BCC相的量会导致FCC [FeCrNi（Mo）]和BCC（Al-Ni）相的微观结构更细，更均匀。随着BCC相体积分数的增加，合金的拉伸屈服强度和硬度呈现出相似的增长趋势。计算应变硬化速率和应变硬化指数以评估合金的拉伸性能。结果表明，Al _0.6 CrFe ₂ Ni ₂ Mo _0.2具有较高的加工硬化能力和稳定的应变硬化速率，因此具有最优异和最全面的机械性能。Al _0.6 CrFe ₂ Ni ₂ Mo _0.2的强度和伸长率的乘积达到38.6 GPa％，高于大多数报道的铸态高熵合金。