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Effects of Al and Y Addition on Microstructures and Mechanical Properties of As‐Cast Mg–14Li Based Alloy
Author(s) -
Gao Zhankui,
Liu Wencai,
Wu Guohua,
Zhang Liang,
Ji Hao,
Ouyang Sijie,
Peng Xiang,
Xiao Lv,
Ding Wenjiang
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800755
Subject(s) - materials science , alloy , ultimate tensile strength , ductility (earth science) , microstructure , metallurgy , homogeneous , base (topology) , composite material , thermodynamics , creep , physics , mathematical analysis , mathematics
In this study, effects of Al and Y contents on microstructural evolutions and mechanical properties of the as‐cast Mg–14Li alloy are investigated. The results show that Mg–14Li– x Al ( x = 1, 2, 3 wt%) alloys are characterized by predominantly single β –Li and MgLiAl 2 phases. Slight refinement of β –Li grains is obtained with the increasing of Al content. The increased Al addition greatly improves the hardness, ultimate tensile strength, and yield strength of the Mg‐14 base alloy, accompanied by a significant reduction in ductility. Meanwhile, with addition of minor Y (0.5 wt%) addition leads to the introduction of homogeneous distribution of Al 2 Y particles in the Mg–14Li–3Al alloy, which plays a positive role in the strength enhancement. However, the uneven distribution of apparently coarsed Al 2 Y particles contributes to a significant reduction in tensile strength as the Y content is increased up to 1 wt%.