Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 30, Issue 8, Pages 2079-2089Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(20)65362-6
Keywords
Mg-Li-Al-Sn alloy; as-cast state; recrystallization; microstructure; tensile properties
Categories
Funding
- National Natural Science Foundation of China [51601076]
- Natural Science Fund for Colleges and Universities in Jiangsu Province, China [17KJA430005]
- China Postdoctoral Science Foundation [2019M650096]
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The effects of Sn content on microstructure and tensile properties of as-cast and as-extruded Mg-8Li-3Al-(1,2,3)Sn (wt.%) alloys were investigated by X-ray diffractometry (XRD), optical microscopy (OM), scanning electron microscopy (SEM) and tensile test. It is found that, as-cast Mg-8Li-3Al-(1,2,3)Sn alloys consist of alpha-Mg+beta-Li duplex matrix, MgLiAl2 and Li2MgSn phases. Increasing Sn content leads to grain refinement of alpha-Mg dendrites and increase in content of Li2MgSn phase. During hot extrusion, complete dynamic recrystallization (DRX) takes place in beta-Li phase while incomplete DRX takes place in alpha-Mg phase. As Sn content is increased, the volume fraction of DRXed alpha-Mg grains is increased and the average grain size of DRXed alpha-Mg grains is decreased. Increasing Sn content is beneficial to strength but harmful to ductility for as-cast Mg-8Li-3Al-(1,2,3)Sn alloys. Tensile properties of Mg-8Li-3Al-(1,2,3)Sn alloys are improved significantly via hot extrusion and Mg-8Li-3Al-2Sn alloy exhibits the best tensile properties.
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