Spheroiding and refining of coarse CaMgSn phase in Mg–Al–Sn–Ca alloys for simultaneously improved strength and ductility via sub-rapid solidification and controlled rolling

Here we report a novel Mg-4.5Al-1.5Sn-0.5Ca (wt%) alloy with high mechanical properties produced via sub-rapid solidification (SRS) and controlled rolling. In virtue of SRS combined with homogenization treatment, the morphology of CaMgSn phase changes from long-rod to refined spherical/quasi-spheric...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2022-02, Vol.834, p.142598, Article 142598
Main Authors: Zha, Min, Liang, Jia-Wei, Xing, Hao, Xu, Hong, Jiang, Bo, Wang, Cheng, Jia, Hai-Long, Wang, Hui-Yuan
Format: Article
Language:English
Subjects:
Alloys
Aluminum
CaMgSn
Chemical precipitation
Controlled rolling
Dispersion
Ductility
Elongation
Grain boundaries
Homogenization
Homogenization treatment
Magnesium base alloys
Mechanical properties
Melting points
Mg–Al–Sn
Precipitates
Rapid solidification
Solidification
Strengthening
Sub-rapid solidification
Ultimate tensile strength
Yield strength
Yield stress
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Summary:Here we report a novel Mg-4.5Al-1.5Sn-0.5Ca (wt%) alloy with high mechanical properties produced via sub-rapid solidification (SRS) and controlled rolling. In virtue of SRS combined with homogenization treatment, the morphology of CaMgSn phase changes from long-rod to refined spherical/quasi-spherical, which cannot be achieved via conventional solidification (CS) followed by homogenization treatment. By subsequent controlled rolling, dispersed nano-sized CaMgSn precipitates (∼16 nm) could form in Mg-4.5Al-1.5Sn-xCa alloys (x = 0.3 and 0.5 wt%). Compared to the rolled Mg-4.5Al-1.5Sn alloy, the rolled Mg-4.5Al-1.5Sn-0.5Ca alloy shows an impressive combination of strength (a yield strength of ∼275 MPa and an ultimate tensile strength of ∼338 MPa) and ductility (an elongation of ∼20%). The increase in yield strength is mainly due to grain boundary strengthening, Orowan strengthening and texture strengthening. The high ductility is enhanced prominently as a result of dispersed nano-sized CaMgSn precipitates. The present work proposes a novel processing strategy to spheroid and refine coarse eutectic CaMgSn phase with a high melting point, which is important in achieving a good synergy of strength and ductility for Mg alloys.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2022.142598