Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 549, Issue -, Pages 46-50Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.09.050
Keywords
Magnesium alloys; Mg-Sn-Al-Zn; Icosahedral phase; Interface
Categories
Funding
- World Premier Materials (WPM) project
- Korea Ministry of Knowledge and Economy
- Global Research Laboratory Program of Korea Ministry of Education, Science and Technology
- Third Stage of Brain Korea 21 Project
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The effect of the selection of the secondary solidification phase on the mechanical properties of the Mg-Sn-Zn and Mg-Sn-Zn-Al alloy rolled sheets has been investigated in the present study. The as-cast microstructure of Mg-7Sn-2Zn (in wt.%) alloy consists of alpha-Mg dendrite and interdendritic Mg2Sn and MgZn2 phases, while that of Mg-7Sn-5Zn-2Al alloy consists of alpha-Mg dendrite and interdendritic Mg2Sn and icosahedral (I-) phases. The micron scale interdendritic I-phase in the as-cast Mg-7Sn-5Zn-2Al alloy dissolves into the matrix during homogenizing treatment, and appears again in the a-Mg matrix as 0.1-0.5 mu m size fine spherical precipitates after rolling process. As a result, the Mg-7Sn-5Zn-2Al alloy exhibits high yield strength of 318 MPa in as-rolled state. The high level of strength is attributed to the presence of finely distributed Mg2Sn and I-phase particles embedded in the alpha-Mg matrix. (c) 2012 Elsevier B.V. All rights reserved.
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