Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 593, Issue -, Pages 70-78Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.11.043
Keywords
Mg-Zn-Y alloy; X-phase; Mn; Mechanical property
Categories
Funding
- National Great Theoretic Research Project [2007CB613700]
- National Sci&Tech Support Project [2011BAE22B01-3]
- International Cooperation Project [2010DFR50010, 2008DFR50040]
- Chongqing SciTech Project [2010CSTC-HDLS]
- Chongqing Science and Technology Commission [CSTC2013JJB50006]
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The effects of Mn addition and the volume fraction of X-phase on the microstructure and mechanical properties of the Mg-Zn-Y-Mn alloys with a Zn/Y ratio (at%) of approximately 0.5 have been systematically investigated. The results show that the addition of Mn produces fine Mn particles dispersed in the matrix, which improve the mechanical properties of the as-extruded Mg-Zn-Y alloy significantly through refining the grain size. XRD analysis reveals that the phases of the Mg-Zn-Y-Mn alloys consist mainly of alpha-Mg, X-phase and Mn. In addition, tensile test results show that the mechanical properties of the as-extruded Mg-Zn-Y-Mn alloys depend closely on the volume fraction of the X-phase. When the Zn/Y ratio is constant, the as-extruded Mg95.21Zn1.44Y2.86Mn0.49 alloy has the best mechanical properties, exhibiting a tensile strength of 421 MPa, a yield strength of 333 MPa and an elongation of 5.85%. The high strength is mainly due to the strengthening by the refinement of alpha-Mg matrix grains through increase in amount of X-phase. (C) 2013 Elsevier B.V. All rights reserved.
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