A range of aluminum-based quaternary alloys was prepared by arc melting, followed by suction casting. Silicon doping was proven to exhibit the high potential of stabilization of face-centered icosahedral (FCI) quasicrystal. The FCI phase stability region in pseudoternary Al-Cu-Fe-(Si) diagram agrees with compositional limitations imposed by Hume-Rothery electron-counting rules. It was found that FCI forms as primary phase for 7 at% Si:Cu/Fe substitution. The finding might allow crystallization of the FCI phase monocrystals directly from the melt. The study revealed the presence of eutectic in Al-Cu-Fe-Si system. It is composed of tetragonal Al₃Si₇ that form between CuAl₂ orthorhombic dendrites and isolated needles of hexagonal Al-Fe-Si intermetallic. The stability of Al₃Si₇ phase was proven experimentally for the first time, but was previously predicted by a number of ab-initio studies. The overall Vickers hardness of the studied alloys was not significantly affected by Si content if doping did not exceed 7 at%. For 10 at% Si:Fe or Si:Cu doping, the hardness dropped by as much as 330 HV1 or 43% with respect to the undoped base alloy. This could be explained by the formation of soft eutectic.

通过电弧熔化，然后进行吸铸，制备了一系列铝基四元合金。事实证明，硅掺杂具有很高的稳定面心二十面体（FCI）准晶体的潜力。拟三元Al-Cu-Fe-（Si）图中的FCI相稳定区域与休ume-热电子计数规则所强加的成分限制相符。已经发现FCI形成为7at％的Si：Cu / Fe取代的主要相。该发现可能允许FCI相单晶直接从熔体中结晶。研究表明，Al-Cu-Fe-Si体系中存在共晶。它由在CuAl ₂之间形成的四方Al ₃ Si ₇组成正交晶状枝晶和六角形的Al-Fe-Si金属间化合物的针状体。Al ₃ Si ₇相的稳定性是首次通过实验证明，但先前已通过许多从头算研究进行了预测。如果掺杂量不超过7 at％，则所研究合金的总维氏硬度不会受到Si含量的显着影响。对于10at％的Si：Fe或Si：Cu掺杂，相对于未掺杂的基体合金，硬度下降多达330 HV1或43％。这可以通过软共晶的形成来解释。