| Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate |
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| 作者姓名： | Zhihui Li Baiqing Xiong Yongan Zhang Baohong Zhu Feng Wang Hongwei Liu |
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| 作者单位： | Zhihui Li，Baiqing Xiong，Yongan Zhang，Baohong Zhu，Feng Wang，and Hongwei Liu State Key Laboratory for Fabrication and Processing of Non-ferrous Metals，General Research Institute for Non-ferrous Metals，Beijing 100088，China |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | The ageing behavior of a pre-stretched thick plate of Al-Zn-Mg-Cu alloy was systemically studied including one-step ageing, two-step ageing, and retrogression and reageing treatment (RRA). One-step ageing of the alloy resulted in peak ultimate tensile strengths of 595 and 575 MPa after 22 and 6 h at 120 and 135°C, respectively. The strengthening phase in peak aged (T6 temper) alloy contained GP zones and the η′ phase predominantly. After two-step ageing, the electrical conductivity was increased markedly, but the pre-stretched thick plate sacrificed a great loss of strength. RRA treatment provided a method for maintaining the strength close to that obtained by T6 temper and for obtaining the high electrical conductivity close to that obtained by T7 temper; the ultimate tensile strength and electrical conductivity were 583 MPa and 21.0 MS/m, respectively. TEM analysis of T7 and RRA specimens revealed two types of precipitates that contributed to age strengthening i.e. the η′ and η phases.
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| 关 键 词： | 延展厚板 铝 锌 镁 铜 合金 老化 张力性能 沉淀 |
| 收稿时间： | 27 November 2006 |
| 修稿时间： | 2006-11-27 |
Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate |
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| Zhihui Li Baiqing Xiong Yongan Zhang Baohong Zhu Feng Wang Hongwei Liu.Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate[J].Journal of University of Science and Technology Beijing,2007,14(3):246-250. |
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| Authors: | Zhihui Li Baiqing Xiong Yongan Zhang Baohong Zhu Feng Wang Hongwei Liu |
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| Affiliation: | State Key Laboratory for Fabrication and Processing of Non-ferrous Metals, General Research Institute for Non-ferrous Metals, Beijing 100088, China |
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| Abstract: | The ageing behavior of a pre-stretched thick plate of Al-Zn-Mg-Cu alloy was systemically studied including one-step ageing,two-step ageing, and retrogression and reageing treatment (RRA). One-step ageing of the alloy resulted in peak ultimate tensile strengths of 595 and 575 MPa after 22 and 6 h at 120 and 135℃, respectively. The strengthening phase in peak aged (T6 temper) alloy contained GP zones and the η' phase predominantly. After two-step ageing, the electrical conductivity was increased markedly, but the pre-stretched thick plate sacrificed a great loss of strength. RRA treatment provided a method for maintaining the strength close to that obtained by T6 temper and for obtaining the high electrical conductivity close to that obtained by T7 temper; the ultimate tensile strength and electrical conductivity were 583 MPa and 21.0 MS/m, respectively. TEM analysis of T7 and RRA specimens revealed two types of precipitates that contributed to age strengthening i.e. the η' and η phases. |
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| Keywords: | Al-Zn-Mg-Cu alloy pre-stretched thick plate ageing tensile properties precipitation |
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