Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate

Zhihui Li, Baiqing Xiong, Yongan Zhang, Baohong Zhu, Feng Wang, Hongwei Liu

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    Zhihui Li, Baiqing Xiong, Yongan Zhang, Baohong Zhu, Feng Wang, and Hongwei Liu, Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate, J. Univ. Sci. Technol. Beijing , 14(2007), No. 3, pp.246-250. https://dx.doi.org/10.1016/S1005-8850(07)60047-4
    Zhihui Li, Baiqing Xiong, Yongan Zhang, Baohong Zhu, Feng Wang, and Hongwei Liu, Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate, J. Univ. Sci. Technol. Beijing , 14(2007), No. 3, pp.246-250. https://dx.doi.org/10.1016/S1005-8850(07)60047-4
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    Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate

    • State Key Laboratory for Fabrication and Processing of Non-ferrous Metals, General Research Institute for Non-ferrous Metals, Beijing 100088, China

    基金项目: 

    This work was financially supported by the National High-Tech Research Development Program of China (No.G2003AA331100).

      通信作者:

      Zhihui Li E-mail: lizhh8086@163.com

    中文摘要

    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℃, 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.

     

    Materials

    Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate

    Author Affilications

      • State Key Laboratory for Fabrication and Processing of Non-ferrous Metals, General Research Institute for Non-ferrous Metals, Beijing 100088, China

    • Funds: 

      This work was financially supported by the National High-Tech Research Development Program of China (No.G2003AA331100).

    • Received: 26 November 2006;
    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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