Abstract

The possibility to apply an electrolytically produced master alloy for grain refinement and improvement of the properties of aluminum alloys is discussed. A commercial Al–Si–Fe alloy with addition of various amounts of an Al–Zr master alloy with 10 wt % zirconium is tested at 900°C. The influence of the zirconium content in the aluminum melt and the cooling rate on its structure and properties is analyzed. Structural analysis demonstrates that addition of 0.1 wt % zirconium decreases the average grain size by 4–5 times without variations in shape and structure. The hardness measurements of the produced alloy demonstrate that, upon addition of zirconium to high-purity aluminum, the hardness increases by 1.5 times at a zirconium content of 0.4 wt % or higher with an increase in the zirconium content. At the same time, a zirconium addition to an AK6 alloy does not influence the Brinell hardness, which is likely to be due to a more pronounced action of other alloying elements. The absence of intermetallic compounds in the produced alloy modified by an Al–Zr master alloy containing intermetallic inclusions up to 50 μm in size indicates that the initial Al–Zr master alloy can be cast into ingots and cooled under any conditions, excluding the remelting stage in a mixer and other types of treatment.

中文翻译：

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Al-Zr 母合金的改性能力

摘要

讨论了应用电解生产的母合金细化晶粒和改善铝合金性能的可能性。在 900°C 下测试添加了不同量的 Al-Zr 中间合金和 10 wt% 锆的商用 Al-Si-Fe 合金。分析了铝熔体中锆的含量和冷却速度对其结构和性能的影响。结构分析表明，添加 0.1 wt% 的锆可使平均晶粒尺寸减小 4-5 倍，而形状和结构没有变化。所生产合金的硬度测量表明，在将锆添加到高纯铝中后，随着锆含量的增加，当锆含量为 0.4 重量％或更高时，硬度增加 1.5 倍。同时，向 AK6 合金中添加锆不会影响布氏硬度，这可能是由于其他合金元素的作用更为明显。由含有最大 50 μm 金属间夹杂物的 Al-Zr 中间合金改性的生产合金中不存在金属间化合物表明初始 Al-Zr 中间合金可以铸造成锭并在任何条件下冷却，重熔阶段除外在混合器和其他类型的处理中。