期刊
MATERIALS LETTERS
卷 59, 期 29-30, 页码 3801-3805出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2005.06.052
关键词
Mg-Zn-Y alloys; icosahedral phase (I-phase); ratio of Zn/Y
Microstructures and mechanical properties of Mg-Zn-Y alloys containing icosahedral phase (I-phase) as a secondary solidification phase have been investigated in the composition range where the total solute content (Zn and Y) is less than 10 wt.%. The optimum Zn/Y ratio for the formation of two-phase microstructure consisting of alpha-Mg and I-phase is 5 similar to 7. The strength increases with increasing total solute content (Zn and Y), i.e. with increasing volume fraction of I-phase. In particular, the alloys containing I-phase exhibit high elongation to failure, >25%, which is ascribed to the low interfacial energy between the I-phase particle and surrounding alpha-Mg crystalline matrix. (C) 2005 Elsevier B.V. All rights reserved.
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