Simultaneously improved strength and ductility in a Ce-doped dual-phase Mg-9Li alloy

被引：0
作者：
Heng, Zhonghao [1 ,2 ]
Huang, Lijuan [1 ]
Zhang, Qianwen [2 ]
Shi, Xianzhe [2 ]
Shen, Jianghua [2 ,3 ]
机构：
[1] Qinghai Univ, Sch Mech Engn, Xining, Qinghai, Peoples R China
[2] Northwestern Polytech Univ, Sch Aeronaut, Xian, Peoples R China
[3] Northwestern Polytech Univ, Shaanxi Key Lab Impact Dynam & Its Engn Applicat, Xian, Shaanxi, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2025年 / 34卷
关键词：
Mg-Li alloy; Mechanical properties; In-situ; Strain incompatibility; Crack growth; IN-SITU SEM; MECHANICAL-PROPERTIES; MAGNESIUM ALLOYS; MICROSTRUCTURAL EVOLUTION; DEFORMATION-BEHAVIOR; CORROSION BEHAVIOR; MG; TEXTURE; BETA;
D O I：
10.1016/j.jmrt.2024.12.206
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Rare earth metals are commonly added into Mg-Li alloys for strength or ductility improvement. In this paper, rare earth element Ce was incorporated into a Mg-Li alloy to modify its mechanical properties. It is found that the addition of small amount Ce (0.6 wt%) improves over 13% tensile strengths of the Mg-Li alloy without expense of ductility, owing to the formation of Mg12Ce precipitates. To illustrate the toughening mechanism, an in-situ tensile experiment was performed focusing on crack initiation and fracture behavior at local regions such as phase boundaries. It is found that the deformation incompatibility occurs between the alpha-Mg and beta-Li phases in Mg-9Li, and local strain analysis suggested that the beta-Li phase contributes more than the alpha-Mg phase to the plasticity. However, the incorporation of Ce enhances the deformability of the alpha-Mg phase by weakening its basal texture, which alleviates the strain incompatibility along the phase boundaries. That is why the strength-ductility dilemma is overcome in the Ce-doped Mg-Li alloy. Besides, microcracks mostly generate within fine strips of alpha-Mg phase for the Ce-free alloy, while for the Ce-doped alloy both the fine alpha-Mg phase and precipitate strips serve as crack initiators.
引用
收藏
页码：2501 / 2511
页数：11
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