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An Experimental Study of Mg Aggregation in AA5754 Alloys byPositron Annihilation Spectroscopy |
| HUANG Chang-Hong 1,2;MA Li 1,2;CHEN Zhi-Quan 1,2;WANG Zhu 1,2;WANG Xiao-Wei 3;ZHANG Hong-Yan 4 |
| 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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| Cite this article: |
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HUANG Chang-Hong, MA Li, CHEN Zhi-Quan et al 2007 Chin. Phys. Lett. 24 546-548 |
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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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78.70.Bj
81.20.Vj. 75.47.Np
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Received: 14 July 2006
Published: 24 February 2007
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