| Microstructures and mechanical properties of double hot-extruded AZ80＋xSr wrought alloys |
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| 引用本文： | 关绍康,朱世杰,王利国,杨卿,曹文博.Microstructures and mechanical properties of double hot-extruded AZ80＋xSr wrought alloys[J].中国有色金属学会会刊,2007,17(6):1143-1151. |
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| 作者姓名： | 关绍康 朱世杰 王利国 杨卿 曹文博 |
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| 作者单位： | School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China |
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| 摘 要： | The effects of Sr addition on microstructures and tensile properties of the as-cast and hot-extruded AZ80 alloys were studied by OM, SEM, EDS, XRD, DSC and Instron tester. The results show that the microstructures of as-cast alloys consist of a-Mg and β-Mg17Al12 phase. Sr gathers on the boundaries, and dissolves into β-Mg17Al12 phase or forms Mg17Sr2 phase. The grains of ascast alloys are refined and discontinuous net-shaped structure is formed. The compound phases on the boundaries become thicker with increasing Sr content. The ultimate tensile stress（UTS） and elongation are improved compared with the corresponding Sr-free alloy. After preliminary hot-extruding, the UTS is up to 308-320 MPa and elongation reaches 8.0%-13.5%. After double hot-extrusion, the dynamic recrystallization completes totally, and the UTS is up to 310-355 MPa, but the elongation does not change apparently. The alloy with 0.02%Sr （mass fraction） obtains the best comprehensive performance with the UTS of 355 MPa and elongation of 13.2%. The SEM morphology of fracture surface shows that the alloys with Sr present good ductility after double hot-extrusion.
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| 关 键 词： | 镁合金 双倍热挤压 拉伸长度 微观结构 机械性质 |
| 收稿时间： | 15 July 2007 |
| 修稿时间： | 2007-07-15 |
Microstructures and mechanical properties of double hot-extruded AZ80+xSr wrought alloys |
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| Shao-kang GUAN, Shi-jie ZHU, Li-guo WANG, Qing YANG,Wen-bo CAO.Microstructures and mechanical properties of double hot-extruded AZ80+xSr wrought alloys[J].Transactions of Nonferrous Metals Society of China,2007,17(6):1143-1151. |
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| Authors: | Shao-kang GUAN Shi-jie ZHU Li-guo WANG Qing YANG Wen-bo CAO |
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| Affiliation: | School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China |
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| Abstract: | The effects of Sr addition on microstructures and tensile properties of the as-cast and hot-extruded AZ80 alloys were studied by OM, SEM, EDS, XRD, DSC and Instron tester. The results show that the microstructures of as-cast alloys consist of  -Mg and β-Mg17Al12 phase. Sr gathers on the boundaries, and dissolves into β-Mg17Al12 phase or forms Mg17Sr2 phase. The grains of as-cast alloys are refined and discontinuous net-shaped structure is formed. The compound phases on the boundaries become thicker with increasing Sr content. The ultimate tensile stress(UTS) and elongation are improved compared with the corresponding Sr-free alloy. After preliminary hot-extruding, the UTS is up to 308–320 MPa and elongation reaches 8.0%-13.5%. After double hot-extrusion, the dynamic recrystallization completes totally, and the UTS is up to 310–355 MPa, but the elongation does not change apparently. The alloy with 0.02%Sr (mass fraction) obtains the best comprehensive performance with the UTS of 355 MPa and elongation of 13.2%. The SEM morphology of fracture surface shows that the alloys with Sr present good ductility after double hot-extrusion. |
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| Keywords: | AZ80 magnesium alloy Sr double hot-extrusion ultimate tensile strength elongation |
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