Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 583, Issue -, Pages 69-77Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.06.054
Keywords
Mg-Zn-Ca alloy; Double extrusion; Grain refinement; Mechanical properties
Categories
Funding
- International Cooperation Key Project
- Ministry of Science and Technology (MOST), China [2010DFB50210]
- National Key Technology R&D Program in the 12th Five year Plan of China [2011BAE22B01]
- National Nature Science Foundation of China [51271063, 11105231]
- National Key Basic Research Program of China [2013CB632200]
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The Mg-4.50Zn-1.13Ca (wt%) alloy was subjected to double extrusion, and the microstructure and mechanical properties of the extruded alloys were investigated. Double extrusion refined the microstructure significantly, resulting in the enhancement of mechanical properties of the double-extruded alloys compared with the single-extruded alloy. The yield strength of the single-extruded alloy was 173 MPa, while the value was increased to 320 MPa and 370 MPa after subsequent second extrusion at 300 degrees C and 250 degrees C, respectively. The second extrusion ratio had little effect on the microstructure and mechanical properties of the double-extruded alloys, while grain size was decreased and strength was increased with the decrease of double extrusion temperature. The double-extruded Mg-Zn-Ca alloy exhibited superior elevated temperature mechanical properties, which was attributed to the fine stable Ca2Mg6Zn3 intermetallic compound particles dispersed in the alloy. (c) 2013 Elsevier B.V. All rights reserved.
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