Technological Development for Neutralizing Contamination by Impurities in Recycled Aluminum Alloys by Control of Solidification Reaction

控制凝固反应中和再生铝合金中杂质污染的技术开发

基本信息

批准号：
09555210
负责人：
KOJIMA Yo
金额：
$ 7.36万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Effects of impurities, which contaminate the melts during recycling, and useful elements for removal of the impurities on mechanical properties of the recycled aluminum alloys were investigated. Furthermore, shapes and sizes of the crystallized compounds, and grain size were altered by an application of electromagnetic casting and micro alloying, and their influences on mechanical properties were also evaluated.(1) When Mn and Zr, which are effective for removal of iron from the melt, are added to the 6061 AI-Mg-Si alloy, a compound containing Si increases with an increase in Mn content and, therefore, age hardenability is lowered and proof stress and tensile strength decrease. The manganese content in the alloy with 0.3% Zr should be less than 0.4mass% to guarantee the tensile properties specified by JIS.(2) When Si, which contaminate 3003 A1-Mn alloy from a cladding material, and Ca, which is an effective element for the removal of Si from the melt, are added to the alloy, the amount … More of a A1-Fe-Si compound increases as Si content increases, resulting in increases in proof stress and tensile strength, but a decrease in elongation. An addition of Ca above 0.3% gives rise to the disappearance of the A1-Fe-Si compound and the crystallization of a large amount of coarse A1ィイD26ィエD2(Fe,Mn) compound, and consequently, to remarkable degradation of elongation.(3) Application of electromagnetic casting to the fabrication of a thin 5052 A1-Mg slab makes the crystallized compounds to be very fine and uniformly distributed. Therefore, even when the amount of crystallized compounds increases with an increase in Fe content, the compounds are useful for the dispersion strengthening and refining of the recrystallized grains. As a result, it is possible to increase proof stress and tensile strength while maintaining enough elongation with Fe content of up to 0.81%.(4) As a result of adding small amount of Mn, Sr and Ca to 6N01 Al-Mg-Si alloy containing 0.7% Fe, it is found that Sr addition of 0.005% refines A1-Fe-Si compound and improves proof strength and tensile strength of T4-treated specimens and elongation of T6-treated specimens, resulting in satisfying JIS requirement on tensile properties Less

研究了回收过程中污染熔体的杂质以及去除杂质的有用元素对回收铝合金机械性能的影响。此外，通过电磁铸造的应用，研究了结晶化合物的形状和尺寸以及晶粒尺寸。 (1) 当 6061 AI-Mg-Si 中添加对熔体除铁有效的 Mn 和 Zr 时合金中，含Si的化合物随着Mn含量的增加而增加，因此，时效淬透性降低，屈服强度和抗拉强度降低，含0.3%Zr的合金中锰含量应低于0.4质量%，以保证抗拉强度。 (2) 当从熔覆材料中污染 3003 Al-Mn 合金的 Si 和从熔体中去除 Si 的有效元素 Ca 时，添加到合金中的 Al-Fe-Si 化合物的量随着 Si 含量的增加而增加，导致屈服强度和拉伸强度增加，但延伸率下降，Ca 添加量超过 0.3% 会导致延伸率降低。 A1-Fe-Si化合物消失，大量粗大A1-D26-D2(Fe,Mn)化合物结晶，导致延伸率显着下降。(3)电磁铸造的应用制造薄5052 Al-Mg板坯时，结晶化合物非常细小且分布均匀，因此，即使结晶化合物的量随着Fe含量的增加而增加，这些化合物也可用于弥散强化和细化。结果，当Fe含量达到0.81%时，可以提高屈服强度和抗拉强度，同时保持足够的伸长率。(4)添加的结果。在含 0.7% Fe 的 6N01 Al-Mg-Si 合金中添加少量 Mn、Sr 和 Ca，发现添加 0.005% Sr 细化了 A1-Fe-Si 化合物，提高了 T4 处理试样的屈服强度和抗拉强度。经过 T6 处理的样品的伸长率，满足 JIS 对拉伸性能的要求更少