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Advances in Materials Science and Engineering
Volume 2013 (2013), Article ID 219347, 7 pages
Research Article

Effects of Aging Treatment on Laser-Welded Mg-Rare Earth Alloy NZ30K

1School of Mechanical Engineering, Changshu Institute of Technology, Changshu 215500, China
2Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai 200240, China
3China Gridcom Company, LTD, Beijing 100070, China

Received 30 May 2013; Accepted 22 August 2013

Academic Editor: Aiguo Xu

Copyright © 2013 Jun Dai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Magnesium-rare earth alloys have received extensive attention due to their attractive mechanical properties resulting from high density of precipitation. The precipitation sequence in laser-welded Mg-3Nd-0.2Zn-0.4Zr (NZ30K) alloy during aging treatment at 200°C and 225°C has been investigated using transmission electron microscopy (TEM). The results indicate that the tensile strength of laser-welded NZ30K can be improved significantly after aging treatment at 200°C for 8 h. It is found that the precipitation in laser-welded NZ30K alloy follows the sequence of supersaturated solid solution → β′′(DO19) → β′(fcc).