1. Microstructures, mechanical properties and corrosion resistances of extruded Mg–Zn–Ca–xCe/La alloys.
- Author
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Tong, L.B., Zhang, Q.X., Jiang, Z.H., Zhang, J.B., Meng, J., Cheng, L.R., and Zhang, H.J.
- Subjects
MICROSTRUCTURE ,ALLOYS ,CORROSION resistant materials ,MECHANICAL behavior of materials ,MAGNESIUM alloys ,MICROALLOYING ,GRAIN size - Abstract
Magnesium alloys are considered as good candidates for biomedical applications, the influence of Ce/La microalloying on the microstructure, mechanical property and corrosion performance of extruded Mg–5.3Zn – 0.6Ca (wt%) alloy has been investigated in the current study. After Ce/La addition, the conventional Ca 2 Mg 6 Zn 3 phases are gradually replaced by new Mg–Zn–Ce/La–(Ca) phases (T 1 ′), which can effectively divide the Ca 2 Mg 6 Zn 3 phase. The Ca 2 Mg 6 Zn 3 /T 1 ′ structure in Mg–Zn–Ca–0.5Ce/La alloy is favorably broken into small particles during the extrusion, resulting in an obvious refinement of secondary phase. The dynamic recrystallized grain size is dramatically decreased after 0.5Ce/La addition, and the tensile yield strength is improved, while further addition reverses the effect, due to the grain coarsening. However, the corrosion resistance of extruded Mg–Zn–Ca alloy deteriorates after Ce/La addition, because the diameter of secondary phase particle is remarkably decreased, which increases the amount of cathodic sites and accelerates the galvanic corrosion process. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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