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Microstructural Evolution and Mechanical Properties of As‐Cast and As‐Extruded Mg–14Li Alloy with Different Zn/Y and Zn/Gd Addition
Author(s) -
Liu Wencai,
Gao Zhankui,
Peng Xiang,
Wu Guohua,
Tong Xin,
Xiao Lv,
Wang Xianfei,
Ding Wenjiang
Publication year - 2020
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.202000480
Subject(s) - materials science , alloy , equiaxed crystals , extrusion , dynamic recrystallization , metallurgy , microstructure , phase (matter) , recrystallization (geology) , grain size , homogeneous , hot working , thermodynamics , paleontology , chemistry , physics , organic chemistry , biology
Herein, the effects of Zn/Y and Zn/Gd addition on microstructural evolution and mechanical properties of the superlight Mg–14Li‐based alloy are investigated. The results show that Mg–14Li‐based alloys are characterized by predominantly single β ‐Li phase. Zn/Y addition leads to the introduction of homogeneous distribution of Mg 3 Zn 3 Y 2 (W phase), Mg 2 Zn 11 , and MgLiZn phases. With the strengthening effect of grain refinement and a large number of precipitates, the mechanical properties of Mg–14Li‐based alloy are improved, whereas MgGd 3 , MgGd, Mg 2 Zn 11 , and GdZn 5 phases appear with the addition of Zn/Gd, which enhance the Mg–14Li‐based alloy significantly due to grain refinement strengthening, the second phase strengthening, and solid solution strengthening. After hot extrusion, dynamic recrystallization (DRX) significantly refines β ‐Li into equiaxed grains, and broken precipitated phases are distributed along the extrusion direction. Mechanical properties of those alloys are improved because of grain refinement and distributed precipitates.