Achieving simultaneous strength-ductility-corrosion optimization of solid-state additive friction stir deposited superlight Mg-Li alloy by a hybrid high flow rate Argon/CO₂ shielding atmosphere
Abstract
High-performance Mg–Li alloys were fabricated via solid-state additive friction stir deposition under a mixed Ar/liquid CO₂ atmosphere, which addresses severe oxidation and unfavorable thermal cycling issues during additive manufacturing. Benefiting from optimized microstructures, the deposited alloys exhibit outstanding comprehensive properties: a surface roughness of 14.32 µm (41.12 µm for the Air group), an ultralow corrosion current density of 10.18 µA·cm⁻², a specific yield strength of 171.72 kN·m·kg⁻¹ and an elongation of 19%, breaking the traditional strength–ductility trade-off. This shielding atmosphere avoids continuous high-purity Ar supply and cuts manufacturing costs, offering an efficient and low-cost route for high-quality additive manufacturing of highly reactive Mg–Li alloys.
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Authors: Zhiguo Lei, Mengran Zhou, Xinyao Sun, Zhuoran Zeng, Tongzheng Xin, Song Tang, Gaoqiang Chen, Yunlei Jiao, Ruizhi Wu, Qingyu Shi
Institutions: Tsinghua University, Dalian University of Technology, Hunan University, Harbin Engineering University, Nanjing University of Science and Technology, Aerospace Research Institute of Materials and Processing Technology, Tianjin Special Equipment Supervision and Inspection Technology Research Institute