期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.03.034
关键词
Mg-Zn-Ca alloy; Extrusion; Texture; Mechanical properties
类别
资金
- 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 [2011BAE22B00]
- National Key Basic Research Program of China [2011CB612200, 2013CB632200]
- National Nature Science Foundation of China [51271063]
A large Mg-4.50Zn-1.13Ca (wt%) alloy ingot 350 mm in diameter and 1730 mm long was successfully fabricated by semi-continuous casting. The microstructures and mechanical properties of the as-cast and as-extruded alloys were investigated. The as-cast alloy exhibits uniform chemical composition and microstructure from the centre to the surface of the ingot and mainly consists of alpha-Mg and Ca2Mg6Zn3. The coarse grains and network-like second phases that are distributed at the grain boundaries result in poor mechanical properties for the as-cast alloy. The mechanical properties of the as-extruded alloys are significantly enhanced. The high yield strengths of the as-extruded alloys mainly result from the fine DRXed grain and the stronger basal texture. (C) 2013 Elsevier B.V. All rights reserved.
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