High-entropy alloys (HEAs) contain multiple principal alloying elements, but usually with simple crystal structures. Quasicrystals are structurally complex phases, but are generally dominated by only one element. However, nearequiatomic high-entropy quasicrystals have rarely been reported because they are difficult to prepare experimentally and predict theoretically. Therefore, the preparation and crystal structures of near-equiatomic high-entropy quasicrystals have drawn much interest. We report a quinary decagonal quasicrystal (DQC) with near-equiatomic alloying elements in Al₂₀Si₂₀Mn₂₀Fe₂₀Ga₂₀ melt-spun ribbons, which is the first to our knowledge. Meanwhile, the structural features of the DQC are characterized in detail. The configurational entropy of both the alloy and DQC satisfies the entropy-based criterion for HEAs, suggesting a high-entropy DQC. Our findings provide a new strategy to develop high-entropy quasicrystals.

高熵合金（HEA）包含多种主要合金元素，但通常具有简单的晶体结构。准晶体是结构复杂的相，但通常仅由一种元素主导。然而，由于难以通过实验制备和理论上的预测，几乎没有准高熵准晶体的报道。因此，近等原子高熵准晶体的制备和晶体结构引起了人们的极大兴趣。我们报告了在Al ₂₀ Si ₂₀ Mn ₂₀ Fe ₂₀ Ga _20中具有近等原子合金元素的五方十边形准晶体（DQC）熔纺色带，这是我们所了解的第一个。同时，详细描述了DQC的结构特征。合金和DQC的构型熵都满足HEA的基于熵的标准，表明DQC具有高熵。我们的发现为开发高熵准晶体提供了新的策略。