Journal
MATERIALS CHARACTERIZATION
Volume 88, Issue -, Pages 7-14Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2013.10.010
Keywords
Magnesium alloys; Long-period stacking ordered structure; Age hardening; Precipitation
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Funding
- National Natural Science Foundation of China [51275295]
- CAST Cooperative Research Centre of Australia
- SAST-SJTU Aerospace Advanced Technology Joint Research Centre [USCAST2012-15]
- Research Fund for the Doctoral Program of Higher Education of China [20120073120011]
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The precipitation process in Mg-10Gd-3Y (wt.%) alloy grain-refined by 0.8 wt.% Al addition has been investigated by transmission electron microscopy. The alloy was given a solution treatment at 520 degrees C for 6 h plus 550 degrees C for 7 h before ageing at 250 degrees C. Plate-shaped intermetallic particles with the 18R-type long-period stacking ordered structure were observed in the solution-treated state. Upon isothermal ageing at 250 degrees C, the following precipitation sequence was identified for the alpha-Mg supersaturated solution: beta '' (D0(19)) -> beta' (bco) -> beta(1) (fcc) -> beta (fcc). The observed precipitation process and age hardening response in the Al grain-refined Mg-10Gd-3Y alloy are compared with those reported in the Zr grain-refined counterpart. (C) 2013 Elsevier Inc. All rights reserved.
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