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Microstructure and Mechanical Properties of Extruded Mg-7Sn-5Zn-xAl (x = 0, 1, 2 and 3 wt.%) Alloy

Authors :
Tingqu Li
Cao Chi
J. L. Jiang
Guangli Bi
Ying Ma
Fengyun Yan
Yuandong Li
Source :
Journal of Materials Engineering and Performance. 28:2672-2680
Publication Year :
2019
Publisher :
Springer Science and Business Media LLC, 2019.

Abstract

Microstructure and mechanical properties of extruded Mg-7Sn-5Zn-xAl (x = 0, 1, 2 and 3 wt.%) alloy were investigated. The as-cast Mg-7Sn-5Zn alloy mainly comprised α-Mg dendrites, Mg2Sn and nanosized Mg-Zn phases in a Mg matrix, whereas the quasicrystal (icosahedral (I)) phase precipitated with the addition of Al. After extrusion, the grain size decreased due to dynamic recrystallization and the resulting particles were crushed and distributed along the extrusion direction. The highest tensile strength was exhibited by the extruded Mg-7Sn-5Zn-2Al alloy, which had a yield strength, ultimate tensile strength and elongation to failure of 198, 343 MPa and 18.7%, respectively. The high tensile strength was mainly attributed to grain refinement and precipitation strengthening of the Mg2Sn and icosahedral phases.

Details

ISSN :
15441024 and 10599495
Volume :
28
Database :
OpenAIRE
Journal :
Journal of Materials Engineering and Performance
Accession number :
edsair.doi...........31218c5f3b0004196c5ddb8396101cfb
Full Text :
https://doi.org/10.1007/s11665-019-04053-8