Deformation mechanisms of β-Li in Mg-Li dual-phase alloy and effects of surface oxide layer

被引：5

作者：

Li, Jing ^{[1
,2
,3
,4
,5
]}

Jin, Li ^{[3
,4
]}

Yi, Sangbong ^{[5
]}

Zhang, Xin ^{[1
,2
]}

Dong, Jie ^{[3
,4
]}

Luo, Ming ^{[1
,2
]}

机构：

[1] Northwestern Polytech Univ, Key Lab High Performance Mfg Aero Engine, Minist Ind & Informat Technol, Xian 710072, Peoples R China

[2] Northwestern Polytech Univ, Engn Res Ctr Adv Mfg Technol Aero Engine, Minist Educ, Xian 710072, Peoples R China

[3] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China

[4] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composite, Shanghai 200240, Peoples R China

[5] Helmholtz Zentrum Hereon, Inst Mat & Proc Design, D-21502 Geesthacht, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 889卷

基金：

中国国家自然科学基金;

关键词：

Mg -Li dual-phase alloy; beta-Li micropillar; Oxide layer; Strength; Dislocations; PLASTIC-DEFORMATION;

D O I：

10.1016/j.msea.2023.145856

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This study investigates the deformation mechanisms of beta-Li micropillar prepared from a Mg-7Li dual-phase alloy with or without surface oxide layer. The beta-Li micropillar with three cross-sectional sizes, 2.5 x 2.5 mu m2, 4.0 x 4.0 mu m2 and 5.5 x 5.5 mu m(2), are studied. The results show that the oxide layer improves the strength of micropillar due to the dislocation trapping effect. When increasing the micropillar size, the oxide layer having nanoporous structure becomes relatively thinner, and the strengthening effect resulting from the oxide layer decreases. Regardless of the existence of the surface oxide layer, all beta-Li micropillars show continuous deformation characteristics. This is ascribed to the interactions between pre-existing dislocations and non-planar dislocations activated during compression, which induces low-angle grain boundary and effectively traps the dislocations at the central area.

引用

页数：6