| 先进高强韧Al-Zn-Mg-Cu合金凝固和均匀化组织及相构成 |
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| 作者姓名： | 舒文祥 侯陇刚 刘君城 刘俊涛 张济山 庄林忠 |
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| 作者单位： | 1. 北京科技大学新金属材料国家重点实验室, 北京 100083; |
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| 基金项目： | 中央高校基本科研业务费专项 |
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| 摘 要： | 采用热力学计算与实验相结合的方法，研究了两种高强韧Al-Zn-Mg-Cu合金铸态及均匀化态的显微组织和相构成.铸态A合金主要由Mg（Zn，Al，Cu）2相和少量Al2Cu相组成，而铸态B合金仅含Mg（Zn，Al，Cu）2相.热力学计算显示，A和B两种合金的实际凝固过程介于Lever Rule和Scheil Model两种模拟结果之间，由于合金成分不同而导致的铸态A和B合金中各相含量差异与Scheil Model模拟所得到的各相摩尔分数变化规律基本一致.经常规工业均匀化处理（460℃保温24 h），铸态A和B合金中存在的Mg（Zn，Al，Cu）2或Al2Cu相均能充分回溶，并得到单相α（Al）基体，这与热力学计算所得到的AlZn-Mg-Cu四元系统在7.5%Zn条件下460℃等温相图相符合.
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| 关 键 词： | 铝合金 热力学计算 凝固 均匀化 相图 |
| 收稿时间： | 2014-09-16 |
Microstructure and phase components of as-cast and homogenized advanced Al-Zn-Mg-Cu alloys with high strength and toughness |
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| Affiliation: | 1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory for Fabrication and Processes of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China |
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| Abstract: | The microstructure and phase components of as-cast and homogenized Al-Zn-Mg-Cu alloys with high strength and toughness were studied by combining thermodynamic calculation with experiments. It is found the secondary phases presented in as-cast alloy A are Mg(Zn,Al,Cu)2 and a small amount of Al2Cu; however, only Mg(Zn,Al,Cu)2 is found in as-cast alloy B. Thermodynamic calculation results show that the real solidification paths of alloys A and B fall between simulations by the Lever rule and the Scheil model, and the differences in content of phases in the two as-cast alloys are consistent with the regularity of the calculated mole fraction of phases formed after solidification in the Scheil model. Mg(Zn,Al,Cu)2 or Al2Cu phase in as-cast alloys A and B can be dissolved completely after conventional homogenization treatment (holding at 460℃ for 24 h), single α(Al) phase can be obtained, and this is consistent with the calculated isothermal section of the Al-Zn-Mg-Cu phase diagram with 7.5% Zn at 460℃. |
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