Journal
MATERIALS & DESIGN
Volume 98, Issue -, Pages 285-293Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.03.025
Keywords
Mg-Zn-Ca alloy; Microalloying; Microstructure; Precipitates; Mechanical properties
Categories
Funding
- National Key Basic Research Program of China [2013CB632200]
- National Natural Science Foundation of China [51271063, 51571068]
- MISiS K3 Project [K3-2015-005]
- Fundamental Research Funds for the Central Universities [HIT. NSRIF.2015003]
- China Postdoctoral Science Foundation [2013M531034]
- Specialized Research Fund for the Doctoral Program of Higher Education [20132302120001]
- Hei Long Jiang Postdoctoral Foundation [LBH-Z13088]
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The Mg-6 mass%Zn alloys microalloyed with different amounts of Ca were cast and extruded. The second phase in the as-cast Mg-6Zn alloy is Mg4Zn7, which is replaced by Ca2Mg6Zn3 with an increase of Ca addition. Microalloying by Ca affects the grain size, dynamic recrystallization, and dynamic precipitation of Mg-6Zn alloys during extrusion. The Ca addition inhibits dynamic recrystallization and grain growth clue to the pinning effect of fine precipitates, giving rise to fine dynamic recrystallized grains. A large amount of precipitates is observed in the Ca containing alloys after extrusion. Ca effectively improves strength of the as-extruded Mg-6Zn alloy, which is mainly attributed to refined dynamic recrystallized grains, dense precipitates, and deformed regions with high-density dislocations and strong basal texture. (C) 2016 Elsevier Ltd. All rights reserved.
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