Abstract–The effect of impurities of iron and silicon on the phase composition and mechanical properties of the Al–6.3Cu–3.2Y wrought aluminum alloy is investigated in this work. According to the results of X-ray diffraction of the cast alloy, the presence of Al₈Cu₄Y, (Al,Cu)₁₁Y, Al₂Cu, and AlCu phases was confirmed, and the presence of peaks that likely correspond to the Al₁₁Cu₂Y₂Si₂ phase was noted. Elongated needle-like inclusions of the Al₁₁Cu₂Y₂Si₂ phase, which does not change its morphology in the course of homogenization, appear against the background of the fragmented compact eutectic. At the temperatures of annealing of the deformed sheets up to 300°C, the structure of alloy is represented by grains elongated along the rolling direction and has a slightly higher hardness than the same alloy without impurities. This is caused by the presence of larger amount of sufficiently dispersed intermetallic particles in the structure. When increasing the annealing temperature, the difference in hardness between the considered alloys decreases. Recrystallization occurs starting from 350°С, the hardness of the alloys levels out. After annealings at 100 and 150°C, the studied alloy demonstrates a good level of strength characteristics, the conditional yield stress is 284–325 MPa, the conditional ultimate strength is 304–369 MPa, which is 20–30 MPa higher than in the alloy without impurities. In general, the presence of permanent impurities of iron and silicon in aluminum does not have a negative effect on the mechanical properties of the studied alloy.

摘要–研究了铁和硅杂质对Al–6.3Cu–3.2Y变形铝合金的相组成和力学性能的影响。根据铸造合金的X射线衍射结果，确认了Al ₈ Cu ₄ Y，（Al，Cu）₁₁ Y，Al ₂ Cu和AlCu相的存在，并且存在可能对应于注意到Al ₁₁ Cu ₂ Y ₂ Si ₂相。Al ₁₁ Cu ₂ Y ₂ Si _2的长针状夹杂物在均质化过程中不改变其形态的相出现在破碎的致密共晶的背景下。在高达300℃的变形片的退火温度下，合金的结构以沿轧制方向伸长的晶粒为代表，并且其硬度比没有杂质的相同合金略高。这是由于在结构中存在大量充分分散的金属间颗粒而引起的。当增加退火温度时，所考虑的合金之间的硬度差减小。从350°С开始发生重结晶，合金的硬度趋于平稳。经过100和150°C的退火处理后，所研究的合金表现出良好的强度特性，条件屈服应力为284–325 MPa，条件极限强度为304–369 MPa，比不含杂质的合金高20–30 MPa。通常，铝中铁和硅的永久杂质不会对研究合金的机械性能产生负面影响。