| Microstructures and Properties of Al-Zn-Mg-Cu-Zr Alloys with Minor Scandium |
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| 作者姓名： | Dai Xiaoyuan Xia Changqing Li Yangyong Sun Zhenqi |
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| 作者单位： | [1]School of Materials Science and Engineering, Central South University, Changsha 410083, China [2]School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410076, China |
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| 摘 要： | The microstructures of Al-Zn-Mg-Cu-Zr al- loys with minor Sc were studied by using optical microscope（OM）, scanning electron microscope （SEM） and transmission electron microscope（TEM）. The tensile mechanical properties and electric conductivity of the studied alloys under different treatment conditions were tested. The results show that adding minor Sc can greatly fines the grain size of the Al-Zn-Mg-Cu-Zr alloy ingots and obviously improves the tensile properties and electric conductivity of the alloys. The strengthening mechanism is considered as fine grain strengthening, sub-structure strengthening and dispersion strengthening by Al3 （Sc, Zr）.
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| 关 键 词： | 钪 显微结构 机械性能 电导率 稀土元素 Al-Zn-Mg-Cu-Zr合金 |
Microstructures and Properties of Al-Zn-Mg-Cu-Zr Alloys with Minor Scandium |
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| Dai Xiaoyuan Xia Changqing Li Yangyong Sun Zhenqi.Microstructures and Properties of Al-Zn-Mg-Cu-Zr Alloys with Minor Scandium[J].Journal of Rare Earths,2006,24(5):635-635. |
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| Authors: | Dai Xiaoyuan Xia Changqing Li Yangyong Sun Zhenqi |
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| Affiliation: | Dai Xiaoyuan~ 1,2*,Xia Changqing~1,Li Yangyong~1,Sun Zhenqi~1 |
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| Abstract: | The microstructures of Al-Zn-Mg-Cu-Zr alloys with minor Sc were studied by using optical microscope(OM), scanning electron microscope (SEM) and transmission electron microscope(TEM). The tensile mechanical properties and electric conductivity of the studied alloys under different treatment conditions were tested. The results show that adding minor Sc can greatly fines the grain size of the Al-Zn-Mg-Cu-Zr alloy ingots and obviously improves the tensile properties and electric conductivity of the alloys. The strengthening mechanism is considered as fine grain strengthening, sub-structure strengthening and dispersion strengthening by Al_3(Sc, Zr). After strengthening solution and T6, the tensile strength of Al-9.0Zn-2.5Mg-1.2Cu-0.15Zr-0.12Sc and Al-9.5Zn-2.5Mg-1.2Cu-0.15Zr-0.12Sc are 829.4, 818.6 MPa respectively. |
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| Keywords: | scandium microstructures mechanical properties electric conductivity rare earths |
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