Abstract

The effect of zirconium and erbium additives on the structure and mechanical properties of the cast alloy Al–5Si–1.3Cu–0.5Mg after the quenching and aging of an ingot and of a deformed sheet has been studied. An increase in the zirconium and erbium content from 0.15 to 0.2 wt % each leads to a substantial modification effect comparable to that via modification with the master alloy AlTi₅B₁. The grain size decreases from 200 to 80 µm in this case, while it reaches 750 µm in the alloy free of additives. The studied alloys are of a much higher ultimate compression yield stress at both room temperature (290–295 MPa) and 200°C (230–235 MPa) due to the smaller grain size and higher number of phases of crystallization origin. In this case, the formation of the erbium-containing phase, which is insoluble in the process of homogenization before quenching, slightly decreases the copper content in the solid solution. An increase in the zirconium and erbium content elevates the recrystallization-onset temperature and, at the same time, has no significant effect on the properties of deformed alloys after their quenching and aging: the yield strength is 271–285 MPa, the ultimate strength is 337–378 MPa, and the relative elongation is 6.7–17.5%.

中文翻译：

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Zr和Er含量对Al-5Si-1.3Cu-0.5Mg合金组织和性能的影响

摘要

研究了锆和铒添加剂对铸锭和变形板淬火和时效后铸造合金 Al-5Si-1.3Cu-0.5Mg 的组织和机械性能的影响。锆和铒含量分别从 0.15 到 0.2 重量% 的增加导致显着的改性效果与通过使用母合金 AlTi ₅ B ₁进行改性的效果相当. 在这种情况下，晶粒尺寸从 200 µm 减小到 80 µm，而在不含添加剂的合金中达到 750 µm。由于较小的晶粒尺寸和较多的结晶相数，所研究的合金在室温 (290–295 MPa) 和 200°C (230–235 MPa) 下都具有更高的极限压缩屈服应力。在这种情况下，在淬火前均化过程中不溶的含铒相的形成使固溶体中的铜含量略有降低。锆和铒含量的增加提高了再结晶开始温度，同时对淬火和时效后变形合金的性能没有显着影响：屈服强度为271-285 MPa，极限强度为337-378 MPa，相对伸长率为6.7-17.5%。