Microstructural evolution of Al-8.59Zn-2.00Mg-2.44Cu during homogenization

Wen-xiang Shu, Jun-cheng Liu, Long-gang Hou, Hua Cui, Jun-tao Liu, Ji-shan Zhang

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    Wen-xiang Shu, Jun-cheng Liu, Long-gang Hou, Hua Cui, Jun-tao Liu, and Ji-shan Zhang, Microstructural evolution of Al-8.59Zn-2.00Mg-2.44Cu during homogenization, Int. J. Miner. Metall. Mater., 21(2014), No. 12, pp.1215-1221. https://dx.doi.org/10.1007/s12613-014-1029-z
    Wen-xiang Shu, Jun-cheng Liu, Long-gang Hou, Hua Cui, Jun-tao Liu, and Ji-shan Zhang, Microstructural evolution of Al-8.59Zn-2.00Mg-2.44Cu during homogenization, Int. J. Miner. Metall. Mater., 21(2014), No. 12, pp.1215-1221. https://dx.doi.org/10.1007/s12613-014-1029-z
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    Microstructural evolution of Al-8.59Zn-2.00Mg-2.44Cu during homogenization

    • State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    • School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    • State Key Laboratory for Fabrication and Processes of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing, 100088, China

    基金项目: 

    This work was supported by the Fundamental Research Funds for the Central Universities of China (No. FRF-TD-12-001) and the Beijing Laboratory of Modern Traffic Metal Materials and Processing Technology. The authors additionally wish to thank CompuTherm LLC for their support in the solidification simulation work.

      通信作者:

      Long-gang Hou E-mail: lghou@skl.ustb.edu.cn

    中文摘要

    The microstructural evolution and phase transformations of a high-alloyed Al-Zn-Mg-Cu alloy (Al-8.59Zn-2.00Mg-2.44Cu, wt%) during homogenization were investigated. The results show that the as-cast microstructure mainly contains dendritic α(Al), non-equilibrium eutectics (α(Al) + Mg(Zn,Al,Cu)2), and the θ (Al2Cu) phase. Neither the T (Al2Mg3Zn3) phase nor the S (Al2CuMg) phase was found in the as-cast alloy. The calculated phase components according to the Scheil model are in agreement with experimental results. During homogenization at 460°C, all of the θ phase and most of the Mg(Zn,Al,Cu)2 phase were dissolved, whereas a portion of the Mg(Zn,Al,Cu)2 phase was transformed into the S phase. The type and amount of residual phases remaining after homogenization at 460°C for 168 h and by a two-step homogenization process conducted at 460°C for 24 h and 475°C for 24 h (460°C/24 h + 475°C/24 h) are in good accord with the calculated phase diagrams. It is concluded that the Al-8.59Zn-2.00Mg-2.44Cu alloy can be homogenized adequately under the 460°C/24 h + 475°C/24 h treatment.

     

    Microstructural evolution of Al-8.59Zn-2.00Mg-2.44Cu during homogenization

    Author Affilications

      • State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

      • School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

      • State Key Laboratory for Fabrication and Processes of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing, 100088, China

    • Funds: 

      This work was supported by the Fundamental Research Funds for the Central Universities of China (No. FRF-TD-12-001) and the Beijing Laboratory of Modern Traffic Metal Materials and Processing Technology. The authors additionally wish to thank CompuTherm LLC for their support in the solidification simulation work.

    • Received: 13 April 2014; Revised: 27 July 2014; Accepted: 02 September 2014;
    The microstructural evolution and phase transformations of a high-alloyed Al-Zn-Mg-Cu alloy (Al-8.59Zn-2.00Mg-2.44Cu, wt%) during homogenization were investigated. The results show that the as-cast microstructure mainly contains dendritic α(Al), non-equilibrium eutectics (α(Al) + Mg(Zn,Al,Cu)2), and the θ (Al2Cu) phase. Neither the T (Al2Mg3Zn3) phase nor the S (Al2CuMg) phase was found in the as-cast alloy. The calculated phase components according to the Scheil model are in agreement with experimental results. During homogenization at 460°C, all of the θ phase and most of the Mg(Zn,Al,Cu)2 phase were dissolved, whereas a portion of the Mg(Zn,Al,Cu)2 phase was transformed into the S phase. The type and amount of residual phases remaining after homogenization at 460°C for 168 h and by a two-step homogenization process conducted at 460°C for 24 h and 475°C for 24 h (460°C/24 h + 475°C/24 h) are in good accord with the calculated phase diagrams. It is concluded that the Al-8.59Zn-2.00Mg-2.44Cu alloy can be homogenized adequately under the 460°C/24 h + 475°C/24 h treatment.

     

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