Journal
FRONTIERS IN MATERIALS
Volume 9, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmats.2022.1050764
Keywords
Mg-Li alloy; high ductility; grain refinement; large strain rolling; dynamic recovery
Categories
Funding
- Fundamental Research Funds for the Central Universities
- [3072021CFT1010]
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This study refined the grain size of Mg-14wt%Li alloy by adding 6% Sn and subsequent large strain rolling, resulting in the development of ultra-fine grained Mg-14Li-6Sn alloy with high strength and high ductility.
Mg-Li alloy is the lowest density structural metal, which has great potential for various industrial applications. Although Mg-Li alloy has excellent plasticity, it has low strength and requires further strengthening. In this study, the grain size of Mg-14 wt% Li alloy was refined to 15.7 mu m by the addition of 6 wt% Sn, the initial grain size of as-cast Mg-14Li alloy was 180 mu m. Furthermore, the grain size of Mg-14Li-6Sn was further refined to 400 nm by the subsequent large strain rolling (LSR). The yield strength of the ultra-fine grained Mg-14Li-6Sn reached 160 MPa, and the elongation was not sacrificed but increased to 30% compared with the as-cast alloy (14%). The microstructural evolution was characterized by optical microscopy (OM), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The high ductility of the ultra-fine grained Mg-14Li-6Sn is attributed primarily to the dynamic recovery, and the increase in strength is mainly due to the grain refinement.
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