The unique structures of micro/nanotubular materials have received extensive attention, while the micro/nanotubular structures of quasicrystals or quasicrystal-related phases, especially oriented arrays, are rarely found. Here, oriented microtube arrays of high-entropy decagonal quasicrystal approximants are prepared in Al₂₀Si₂₀Mn₂₀Fe₂₀Ga₂₀ alloy by simple melt spinning. Transmission electron microscopy revealed microtubes are mostly composed of alternating arrangements of (1/0, 2/1) quasicrystal approximant domains (lattice constants: a = 0.73 nm, b = 1.23 nm, and c = 2.24 nm) and defective (1/0, 2/1) domains. However, heat treatment leads to the change of the structure and morphology of microtubes. At 873 K, a primitive cubic phase existed, and at 973 K, microtube morphology disintegrated and the (1/0, 2/1)-related domain transformed into complex domains, showing instability. By nanoindentation testing, microtubes show the hardness of 10.9 GPa and the elastic modulus of 189.3 GPa. However, after heat treatment at 873 K, these values decreased to 5.3 GPa and 128.4 GPa, and to 3.2 GPa and 107.9 GPa at 973 K. We demonstrate that the formation of microtubes is mainly related to the temperature gradient, twinning growth of approximant domains, and also the insufficient supply of raw materials in the later stages of solidification.

微纳管材料的独特结构受到广泛关注，而准晶或准晶相关相，特别是定向阵列的微纳管结构却很少被发现。_{在这里，通过简单的熔体纺丝在 Al 20} Si ₂₀ Mn ₂₀ Fe ₂₀ Ga ₂₀合金中制备了高熵十方准晶近似体的定向微管阵列。透射电子显微镜显示微管主要由（1/0，2/1）准晶近似域交替排列组成（晶格常数：a  = 0.73 nm，b  = 1.23 nm，c = 2.24 nm）和缺陷域（1/0、2/1）。然而，热处理导致微管的结构和形貌发生变化。在873 K时，存在原始立方相，在973 K时，微管形态解体，(1/0,2/1)相关域转变为复杂域，表现出不稳定。通过纳米压痕测试，微管的硬度为10.9 GPa，弹性模量为189.3 GPa。然而，在 873 K 热处理后，这些值下降至 5.3 GPa 和 128.4 GPa，在 973 K 热处理后下降至 3.2 GPa 和 107.9 GPa。我们证明微管的形成主要与温度梯度、近似域的孪晶生长有关。 ，还有凝固后期原材料供应不足。