期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.04.119
关键词
Mg-Y-Zn-Sr alloy; Long-period stacking ordered (LPSO) structure; Modification; Stacking faults (SF)
类别
资金
- National Nature Science Foundation of China [50571073]
- Ph. D. Programs Foundation of Ministry of Education of China [20111402110004]
- Natural Science Foundation of Shanxi Province [2009011028-3]
The 18R and 14H long-period stacking ordered (LPSO) structures formed in the as-cast and solution-treated Mg93.96Zn2Y4Sr0.04 (at.%) alloys prepared by conventional permanent mold casting were investigated systematically by XRD, DSC, SEM and TEM. The examination of microstructure evolution revealed that part of the X-phase dissolved gradually into the alpha-Mg matrix and a fine plate-like phase with 14H LPSO structure was presented in the matrix during solution treatment at 773 K for 35 h. Furthermore, the refinement of X-phase and increment in the volume fraction of the lamellar regions in this phase could be discerned upon the addition of trace Sr (0.13 wt.%) to the Mg94Zn2Y4 alloy. The improvement in ductility of the alloy could be ascribed to both the grain refinement and the appearance of stacking faults (SF) in the alpha-Mg matrix. (C) 2012 Elsevier B.V. All rights reserved.
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