Na partitioning during thermomechanical processing of an Mg-Sn-Zn-Na alloy

Terbush, Jessica R., Stanford, Nicole, Nie, Jian-Feng and Barnett, Matthew R. 2013, Na partitioning during thermomechanical processing of an Mg-Sn-Zn-Na alloy, Metallurgical and materials transactions A, vol. 44, no. 11, pp. 5216-5225, doi: 10.1007/s11661-013-1872-y.

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Title Na partitioning during thermomechanical processing of an Mg-Sn-Zn-Na alloy
Author(s) Terbush, Jessica R.
Stanford, Nicole
Nie, Jian-Feng
Barnett, Matthew R.ORCID iD for Barnett, Matthew R.
Journal name Metallurgical and materials transactions A
Volume number 44
Issue number 11
Start page 5216
End page 5225
Total pages 10
Publisher Springer
Place of publication Berlin, Germany
Publication date 2013-11
ISSN 1073-5623
Summary Microstructural characterization was used to examine the changes that occur in an Mg-6Sn-5Zn-0.3Na alloy from casting to extrusion at either 623 K or 723 K (350 _C or 450 _C) followed by artificial aging at 473 K (200 _C). In particular, the partitioning of Na was examined at each step using STEM-EDS mapping. Na atoms were found to preferentially partition to the Mg-Zn phase when present. After extrusion, when no Mg-Zn was observed, the spherical Mg2Sn particles were found to be enriched in Na, particularly at the higher extrusion temperature. Artificial aging following extrusion resulted in a change in Na partitioning, and a coarse distribution of Mg-Zn precipitate rods. Na microadditions led to a high as-extruded hardness, but a significant tension–compression yield asymmetry was still observed at room temperature. The compressive yield strength was found to decrease significantly after 1000 hours of aging.
Language eng
DOI 10.1007/s11661-013-1872-y
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2013, Springer
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