Applying Precipitates as Getter for Impurities in 6000 Series of Aluminum Alloys during Recycling Process.

在回收过程中应用沉淀物作为 6000 系列铝合金中杂质的吸气剂。

• 批准号: 11650686
• 负责人: YAMAMOTO Atsushi
• 金额: $ 1.22万
• 依托单位: Himeji Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650686/
• 关键词: Recycling; Aluminum alloy; 6000 series of aluminum alloys; precipitates; Impurities; 折出物; Al-Mg-Si系合金

Effects of excess Si and Mg, and impurity Fe on precipitation in 6061 aluminum alloys have been investigated. They were solely added to a 6061 base alloy and also added as combinations of (Si+Fe) and (Mg+Fe). Peak hardness increased with addition of Si and (Si+Fe), but decreased with addition of Fe, Mg and (Fe+Mg). Measurements of specific heat vs. temperature curves and electric resistivity vs. temperature curves and transmission electron microscopy and energy dispersive X-ray analyses showed that precipitates contributed to age hardening were same among the alloys, but that intermetallic inclusions in AlFeSi and AlSiFeMnCr systems were formed having variations in concentrations of each elements depending on the compositions of the alloys. The inclusion would be effective to reduce grain sizes and to prevent decreasing in tensile strength. With forming the inclusions and medium-size precipitates, which are considered to be formed during solidification and hot rolling, effective amount of Si is decreased in the matrix, resulting in decrease of Mg-Si type of precursors and precipitates and decrease in hardness and tensile strength. The amounts of Si included in the inclusions and medium-size precipitates are about 10 to 20 at% in all the alloys, therefore, the decrease of effective Si depends on the volume fractions of such phases which are increased by excess Fe and Mg. An effective amount of Si, Si^* would be calculated as Si^*=Si-2/3(Fe-0.05) when Mg/2>Si^*, while Si^*=Mg/2 when Mg/2<Si-2/3(Fe-0.05).Addition of excess Fe as an impurity element in 6061 aluminum alloy does not affects the precipitates phases which attribute to age hardening, but accelerates formation of dispersoid particles which can prevent grain growth during recrystallization and lead to recover the tensile strength of alloys.

已经研究了过量的Si和Mg以及杂质FE对6061铝合金降水的影响。它们仅被添加到6061碱基合金中，还添加为（Si+Fe）和（mg+fe）的组合。峰硬度随添加Si和（Si+Fe）而增加，但随着Fe，Mg和（Fe+mg）的添加而降低。测量特定的热量与温度曲线和电阻率与温度曲线以及传输电子显微镜以及能量分散X射线分析的测量表明，在合金中有助于年龄增强的沉淀物相同，但是在依赖于各种元素的浓度中，Alfesi和Alsifemn系统中的金属内包含在各种元素的浓度中形成了变化。包含将有效减少晶粒尺寸并防止抗拉力强度降低。随着形成夹杂物和中型沉淀，被认为在固化和热滚动过程中形成的夹杂物和中型沉淀物在矩阵中有效量减少，从而导致MG-SI类型的前体和沉淀物减少并减少硬度和拉伸强度。夹杂物和中型沉淀物中包含的Si量约为所有合金中的10至20 at％，因此，有效Si的降低取决于此类相的体积分数，这些体积分数因多余的Fe和Mg而增加。 An effective amount of Si, Si^* would be calculated as Si^*=Si-2/3(Fe-0.05) when Mg/2>Si^*, while Si^*=Mg/2 when Mg/2<Si-2/3(Fe-0.05).Addition of excess Fe as an impurity element in 6061 aluminum alloy does not affects the precipitates phases which attribute to age hardening, but加速形成分散颗粒，可以防止在重结晶过程中晶粒生长，并导致恢复合金的拉伸强度。

项目成果

A.Yamamoto,H.Tsubakino,A.Suehiro and A.Watanabe: "Effects of Excess Si, Excess Mg and Fe on Precipitation in 6061 Aluminum Alloys during Recycling Process"Mater.Sci.Forum. 331-337. 1125-1130 (2000)

A.Yamamoto、H.Tsubakino、A.Suehiro 和 A.Watanabe：“回收过程中过量 Si、过量 Mg 和 Fe 对 6061 铝合金中沉淀的影响”Mater.Sci.Forum。

A.Yamamoto,H.Tsubakino,A.Suehiro,A.Watanabe,A.Nogami,T.Ohnishi and M.Kanno: "Precipitation in 6061 Aluminum Alloys Containing Intermetallic Inclusions."Supplement of International J. of Materials & Product Technology, ed. by T. Kobayashi, Z.G.Wang, M.Niin

A.Yamamoto、H.Tsubakino、A.Suehiro、A.Watanabe、A.Nogami、T.Ohnishi 和 M.Kanno：“含有金属间夹杂物的 6061 铝合金中的沉淀”。《国际材料杂志》增刊

A.Yamamoto,H.Tsubakino,A.Suehiro,A.Watanabe,A.Nogami.T.Ohnishi and M.Kanno: "Precipitation in 6061 Aluminum Alloys Containing Intermetallic Inclusions."Supplement of International J. of Materials & Product Technology, ed.by T.Kobayashi,Z.G.Wang,M.Niinomi,

A.Yamamoto、H.Tsubakino、A.Suehiro、A.Watanabe、A.Nogami.T.Ohnishi 和 M.Kanno：“含有金属间夹杂物的 6061 铝合金中的沉淀。”国际材料杂志增刊

A.Yamamto,H.Tsubakino,A.Suehiro,A.Watanabe,T.Ohnishi and M.Kannno: "Effects of Excess Si,Excess Mg and Fe on Precipitation in 6061 Aluminum Alloys during Recycling Process"Proc.Inter.Conf.Aluminum Alloys(ICAA-7). (in press). (2000)

A.Yamamto、H.Tsubakino、A.Suehiro、A.Watanabe、T.Ohnishi 和 M.Kannno：“回收过程中过量 Si、过量 Mg 和 Fe 对 6061 铝合金中沉淀的影响”Proc.Inter.Conf。

A.Yamamoto, H.Tsubakino, A.Suehiro and A.Watanabe: "Effects of Excess Si, Excess Mg and Fe on Precipitation in 6061 Aluminum Alloys during Recycling Process."Mater.Sci.Forum. vol.331-337. 1125-1130 (2000)

A.Yamamoto、H.Tsubakino、A.Suehiro 和 A.Watanabe：“回收过程中过量 Si、过量 Mg 和 Fe 对 6061 铝合金中沉淀的影响。”Mater.Sci.Forum。