Abstract

The effect of impurities on the phase composition and properties of a wrought alloy of the Al–Cu–Er system has been investigated in this work. According to the results of the scanning electron microscopy and X-ray diffraction analysis, Al₈Cu₄Er, Al₃Er, and Al₃Er₂Si₂ particles of phases of crystallization origin are present in the structure of the alloy. After annealing at 605°C, the Al₈Cu₄Er and Al₃Er phases have compact morphology close to spherical with a maximum size of particles up to 3 μm, and the Al₃Er₂Si₂ phase has a needle shape with a length of up to 15 μm. No needle-shaped particles have been detected in the structure after rolling, which indicates the fragmentation of the Al₃Er₂Si₂ phase. Iron and silicon impurities do not have a significant effect on the alloy recrystallization, but somewhat increase its hardness after annealing at low temperatures (to 250°C). After annealing at 100 and 150°C, the investigated alloy shows a sufficiently high level of mechanical properties: according to the results of tests for uniaxial tension, its proof stress is 277–310 MPa and the ultimate strength is 308–350 MPa, which is 10–30 MPa more than that in the alloy without impurities.

中文翻译：

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杂质对变形的Al–6％Cu–4.05％Er合金相组成和性能的影响

摘要

在这项工作中，已经研究了杂质对Al–Cu–Er系可锻合金的相组成和性能的影响。根据扫描电子显微镜和X射线衍射分析的结果，在合金的结构中存在结晶起源相的Al ₈ Cu ₄ Er，Al ₃ Er和Al ₃ Er ₂ Si ₂颗粒。在605°C退火后，Al ₈ Cu ₄ Er和Al ₃ Er相具有接近球形的致密形态，最大粒径为3μm，Al ₃ Er ₂ Si ₂相呈针状，长度最大为15μm。轧制后未在组织中检测到针状颗粒，这表明Al ₃ Er ₂ Si ₂相碎裂。铁和硅杂质对合金的再结晶影响不大，但在低温（至250°C）下退火后，其硬度会有所提高。在100和150°C下退火后，所研究的合金表现出足够高的机械性能：根据单轴拉力的测试结果，其屈服强度为277-310 MPa，极限强度为308-350 MPa，比不含杂质的合金高10-30 MPa。