| Microstructural characteristics and paint-bake response of Al-Mg-Si-Cu alloy |
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| 作者姓名： | 纪艳丽 郭富安 潘琰峰 |
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| 作者单位： | Suzhou Institute for Nonferrous Metals Research, Suzhou 215026, China |
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| 基金项目： | Project（2006KJA09） supported by Scientific and Technical Expansion Fund of China Aluminum Corporation |
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| 摘 要： | The microstructural characteristics and paint-bake response of 6022 alloy with 0.3% Cu （mass fraction） were studied using optical microscope, scanning electron microscope（SEM）, transmission electron microscope（TEM） and tensile tester. The results indicate that the phase constituents in the as-cast microstructure are Mg2Si, Si, Al5Cu2Mg8Si6, Al5FeSi, α-Al（MnCrFe）Si and CuAl2. During the following homogenization, CuAl2, Al5Cu2Mg8Si6 and Mg2Si phases are almost completely dissolved, and Al5FeSi transforms to α-Al（MnCrFe）Si particles. After rolling, the phase constituents in the alloy change less except the precipitation of Mg2Si particles, and the precipitation behavior of Mg2Si strongly depends on the thermomechanical conditions. Cu addition significantly increases the paint-bake response of 6022 alloy by facilitating the formation of β＂ phase. Therefore, the tensile strength of 6022 alloy with 0.3% Cu is higher than that of 6022 alloy without Cu after paint-bake cycle.
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| 关 键 词： | Al-Mg-Si-Cu合金 油漆 热处理 显微结构 |
| 收稿时间： | 2007-01-04 |
| 修稿时间： | 2007-10-17 |
Microstructural characteristics and paint-bake response of Al-Mg-Si-Cu alloy |
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| JI Yan-li,GUO Fu-an,PAN Yan-feng.Microstructural characteristics and paint-bake response of Al-Mg-Si-Cu alloy[J].Transactions of Nonferrous Metals Society of China,2008,18(1):126-131. |
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| Authors: | JI Yan-li GUO Fu-an PAN Yan-feng |
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| Affiliation: | Suzhou Institute for Nonferrous Metals Research, Suzhou 215026, China |
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| Abstract: | The microstructural characteristics and paint-bake response of 6022 alloy with 0.3% Cu (mass fraction) were studied using optical microscope, scanning electron microscope(SEM), transmission electron microscope(TEM) and tensile tester. The results indicate that the phase constituents in the as-cast microstructure are Mg2Si, Si, Al5Cu2Mg8Si6, Al5FeSi, α-Al(MnCrFe)Si and CuAl2. During the following homogenization, CuAl2, Al5Cu2Mg8Si6 and Mg2Si phases are almost completely dissolved, and Al5FeSi transforms to α-Al(MnCrFe)Si particles. After rolling, the phase constituents in the alloy change less except the precipitation of Mg2Si particles, and the precipitation behavior of Mg2Si strongly depends on the thermomechanical conditions. Cu addition significantly increases the paint-bake response of 6022 alloy by facilitating the formation of β" phase. Therefore, the tensile strength of 6022 alloy with 0.3% Cu is higher than that of 6022 alloy without Cu after paint-bake cycle. |
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| Keywords: | Al-Mg-Si-Cu alloy paint-bake response Cu |
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