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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

研究了回收过程中杂质对铝合金熔体的污染以及去除杂质的有效元素对回收铝合金力学性能的影响。此外，通过电磁铸造和微合金化的应用程序，改变结晶化合物的形状和尺寸，以及晶粒尺寸，并评估其对机械性能的影响。(1)当Mn和Zr（它们对从熔体中除去铁是有效的）加入到6061 Al-Mg-Si合金中时，含Si的化合物随着Mn含量的增加而增加，因此，时效硬化性降低，屈服应力和抗拉强度降低。含0.3%Zr的合金中的锰含量应小于0.4mass%，以保证JIS规定的拉伸性能。(2)当从覆层材料中污染3003 Al-Mn合金的Si和从熔体中除去Si的有效元素Ca加入到合金中时， ...更多信息随着Si含量的增加，Al-Fe-Si化合物的屈服强度和抗拉强度增加，但伸长率降低。当Ca的加入量超过0.3%时，Al-Fe-Si化合物消失，大量粗大的Al_（1-x）D_26-x）D_2（Fe，Mn）化合物结晶，从而使延伸率显著降低。(3)应用电磁铸造技术制备5052铝镁合金薄板坯，使结晶相非常细小且分布均匀。因此，即使当结晶化合物的量随着Fe含量的增加而增加时，该化合物也可用于再结晶晶粒的分散强化和细化。结果，当Fe含量高达0.81%时，可以提高屈服应力和抗拉强度，同时保持足够的延伸率。(4)在含0.7%Fe的6 N 01铝镁硅合金中加入少量的Mn、Sr和Ca，发现加入0.005%Sr细化了Al-Fe-Si化合物，提高了T4处理试样的屈服强度和抗拉强度，提高了T6处理试样的延伸率，使拉伸性能满足JIS要求。