| An Experimental Study of Mg Aggregation in AA5754 Alloys by Positron Annihilation Spectroscopy |
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| 作者姓名： | 黄长虹 马莉 陈志权 王柱 王晓伟 张洪延 |
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| 作者单位： | [1]Department of Physics, Wuhan University, Wuhan 430072 [2]Hubei Nuclear Solid Physics Key Laboratory, Wuhan University, Wuhan 430072 [3]Shenyang National Laboratory of Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 [4]Department of MIME, University of Toledo, Toledo, OH 43606, USA |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 10375043, 10075037, 50371087 and 90206044. Acknowledgments The authors would like to thank Professor Liangyue Xiong for positron lifetime measurement. |
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| 摘 要： | Defects in an AA5754 （Al-3.0%Mg） alloy are investigated by coincidence Doppler broadening spectroscopy and positron lifetime spectroscopy. The results indicate enhancement of positron trapping by Mg atoms in this Al-Mg alloy after quenching treatment at 623K, which may be due to the formation of vacancy-Mg complexes or the aggregation of Mg near the vacancy sites. It is speculated that the aggregation of Mg atoms in the moderate temperature range is responsible for cracking in spot welding of AA5754 alloys.
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| 关 键 词： | AA5754合金 镁聚集 正电子湮灭 光谱学 |
| 收稿时间： | 2006-7-14 |
| 修稿时间： | 2006-07-14 |
An Experimental Study of Mg Aggregation in AA5754 Alloys byPositron Annihilation Spectroscopy |
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| HUANG Chang-Hong,MA Li,CHEN Zhi-Quan,WANG Zhu,WANG Xiao-Wei,ZHANG Hong-Yan.An Experimental Study of Mg Aggregation in AA5754 Alloys by Positron Annihilation Spectroscopy[J].Chinese Physics Letters,2007,24(2):546-548. |
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| Authors: | HUANG Chang-Hong MA Li CHEN Zhi-Quan WANG Zhu WANG Xiao-Wei ZHANG Hong-Yan |
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| Institution: | 1Department of Physics, Wuhan University, Wuhan 430072 ; 2Hubei Nuclear Solid Physics Key Laboratory, Wuhan University, Wuhan 430072;3Shenyang National Laboratory of Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 ; 4Department of MIME, University of Toledo, Toledo, OH 43606, USA |
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| Abstract: | Defects in an AA5754 (Al-3.0%Mg) alloy are investigated by coincidence Doppler broadening spectroscopy and positron lifetime spectroscopy. The results indicate enhancement of positron trapping by Mg atoms in this Al--Mg alloy after quenching treatment at 623K, which may be due to the formation of vacancy-Mg complexes or the aggregation of Mg near the vacancy sites. It is speculated that the aggregation of Mg atoms in the moderate temperature range is responsible for cracking in spot welding of AA5754 alloys. |
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| Keywords: | 78 70 Bj 81 20 Vj 75 47 Np |
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