| Redistribution and re-precipitation of solute atom during retrogression and reaging of A1-Zn-Mg-Cu alloys |
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| 引用本文： | 宁爱林 刘志义 彭北山 曾苏民. Redistribution and re-precipitation of solute atom during retrogression and reaging of A1-Zn-Mg-Cu alloys[J]. 中国有色金属学会会刊, 2007, 17(5): 1005-1011. DOI: 10.1016/S1003-6326(07)60216-7 |
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| 作者姓名： | 宁爱林 刘志义 彭北山 曾苏民 |
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| 作者单位： | [1]School of Materials Science and Engineering, Central South University, Changsha 410083, China [2]Department of Mechanical Engineering, Shaoyang University, Shaoyang 422000, China |
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| 基金项目： | Project（2001AA332030） supported by the National Hi-Tech Research and Development Program of China |
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| 摘 要： | The redistribution and re-precipitation of solute atom during retrogression and reaging of three different A1-Zn-Mg-Cu aluminum alloys were investigated. The results of hardness and tensile strength test indicate that after pre-aging at 100 ℃ or 120 ℃ and retrogressing at 200 ℃ for various time and re-aging treatment, the hardness and strength of the alloys are all larger than those under pre-aging condition, some of them even exceed the value under peak aging（T6） condition. TEM observation shows that the PFZ formed during retrogressing in short time becomes narrow and even disappears after re-aging treatment. However, the PFZ formed during retrogressing for a long time does not narrow after re-aging treatment. It is suggested that the redistribution and re-precipitation of solute atom during re-aging treatment result in the narrowing and even disappearance of the PFZ formed during retrogression, which reinforces the grain-boundaries and presents the value of tensile strength exceeding peak-aging strength in the RRA condition, while the precipitates in the matrix of the alloys still keep or even exhibit a more dispersed distribution, and a greater effect of precipitation strengthening is obtained.
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| 关 键 词： | Al-Zn-Mg-Cu复合物 铝合金 老化现象 金属 |
| 收稿时间： | 2007-01-19 |
| 修稿时间： | 2007-01-19 |
Redistribution and re-precipitation of solute atom during retrogression and reaging of A1-Zn-Mg-Cu alloys |
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| NING Ai-lin,LIU Zhi-yi,PENG Bei-shan,ZENG Su-min,. Redistribution and re-precipitation of solute atom during retrogression and reaging of A1-Zn-Mg-Cu alloys[J]. Transactions of Nonferrous Metals Society of China, 2007, 17(5): 1005-1011. DOI: 10.1016/S1003-6326(07)60216-7 |
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| Authors: | NING Ai-lin LIU Zhi-yi PENG Bei-shan ZENG Su-min |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Department of Mechanical Engineering, Shaoyang University, Shaoyang 422000, China |
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| Abstract: | The redistribution and re-precipitation of solute atom during retrogression and reaging of three different Al-Zn-Mg-Cu aluminum alloys were investigated. The results of hardness and tensile strength test indicate that after pre-aging at 100 °C or 120 °C and retrogressing at 200 °C for various time and re-aging treatment, the hardness and strength of the alloys are all larger than those under pre-aging condition, some of them even exceed the value under peak aging(T6) condition. TEM observation shows that the PFZ formed during retrogressing in short time becomes narrow and even disappears after re-aging treatment. However, the PFZ formed during retrogressing for a long time does not narrow after re-aging treatment. It is suggested that the redistribution and re-precipitation of solute atom during re-aging treatment result in the narrowing and even disappearance of the PFZ formed during retrogression, which reinforces the grain-boundaries and presents the value of tensile strength exceeding peak-aging strength in the RRA condition, while the precipitates in the matrix of the alloys still keep or even exhibit a more dispersed distribution, and a greater effect of precipitation strengthening is obtained. |
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| Keywords: | Al-Zn-Mg-Cu aluminum alloy retrogression and reaging PFZ |
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