Microstructure and properties of A1-Cu-Mg-Ag alloy exposed at 200℃ with and without stress |
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引用本文: | 夏卿坤,刘志义,李云涛.Microstructure and properties of A1-Cu-Mg-Ag alloy exposed at 200℃ with and without stress[J].中国有色金属学会会刊,2008,18(4):789-794. |
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作者姓名: | 夏卿坤 刘志义 李云涛 |
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基金项目: | Project(2005CB623705-04) supported by the National Basic Research Program of China |
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摘 要: | The effect of stress on the microstructure and properties of an Al-Cu-Mg-Ag alloy under-aged at 165℃ for 2 h during thermal exposure at 200℃ was investigated. The tensile experimental results show that the remained tensile strength of both specimens at room temperature after being exposed at 200℃ with and without applying stress rises firstly, and then drops with the increasing of exposure time. The peak value of the remained strength reaches 439 MPa for non-stress-exposure for l0 h, and 454 MPa after being exposed with stress loaded for 20 h at 220 MPa. The elongation change is similar to that of strength. After being exposed for 100 h, specimen exposed at 220 MPa still remains a tensile strength of 401 MPa, larger than that exposed without applying stress. TEM shows that the microstructure of under-aged alloy is dominated by Ω phase mainly and a little θ' phase. The θ and Ω phases are believed competitive with increasing exposure time. The width of precipitation free zone(PFZ) increases and the granular second phase precipitates at grain-boundary correspondingly. It is shown that the mechanical properties of alloy decrease slightly and present good thermal stability after thermal exposure at 200 ℃ and 220 MPa for 100 h.
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关 键 词: | 铝铜镁银合金 微观结构 圧力 机械性能 |
Microstructure and properties of A1-Cu-Mg-Ag alloy exposed at 200℃ with and without stress |
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Affiliation: | [1]Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China [2]School of Materials Science and Engineering, Central South University, Changsha 410083, China [3]Department of Mechanical and Electrical Engineering, Changsha University, Changsha 410003, China |
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Abstract: | Al-Cu-Mg-Ag alloy thermal exposure stress microstructure mechanical properties |
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Keywords: | Al-Cu-Mg-Ag alloy thermal exposure stress microstructure mechanical properties |
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