| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 828145 | Materials & Design | 2016 | 9 Pages |
•The divorced Mg4Zn7 in the as-cast Mg-6Zn alloy was replaced by lamellar Ca2Mg6Zn3 with increasing Ca addition.•Ca addition refined the microstructure, promoted dynamic precipitation and inhibited dynamic recrystallization.•Ca addition improved strength of Mg-6Zn alloys, attributed to fine grains, high density precipitates and strong texture.
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 due 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.
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