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Shanghai Jiao Tong University Fabricates High-Reinforcement-Phase Magnesium-Lithium Matrix Composite via Cold Metal Transfer Arc-Directed Energy Deposition

2026-06-08

Researchers at Shanghai Jiao Tong University have fabricated magnesium-lithium (Mg-Li) matrix composite components using Cold Metal Transfer Arc-Directed Energy Deposition (CMT DED-arc). By optimizing the process parameters (wire feed speed of 7 m/min), excellent forming quality and enhanced mechanical properties were achieved. The rapid solidification and high cooling rate of CMT DED-arc significantly refined α-Mg grains, reducing the average grain size from 65.5 μm in the base alloy to 17.2 μm, primarily contributing to strength enhancement via the Hall-Petch mechanism. Compared to the base alloy, the as-deposited component showed an increase in yield strength from 147.4 MPa to 186 MPa, ultimate tensile strength from 158 MPa to 226.3 MPa, and elastic modulus from 45.8 GPa to 53.2 GPa. Mg-Li alloys are the lightest metal structural materials, and this study provides a forward-looking technical pathway for the rapid manufacturing of high-performance Mg-Li matrix composite components.

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上海交大利用冷金属转移电弧定向能量沉积技术，制备高增强相镁锂基复合材料

上海交通大学的研究人员利用冷金属转移电弧定向能量沉积(CMT DED-arc)技术制备了镁锂基复合材料构件。通过优化工艺参数（送丝速度7 m/min），获得了优异的成形质量和增强的力学性能。CMT DED-arc的快速凝固和高冷却速率使α-Mg晶粒显著细化，平均尺寸从基体合金的65.5μm降至17.2μm，主要通过Hall-Petch机制贡献强度提升。与基体合金相比，沉积态构件屈服强度从147.4MPa提升至186MPa，极限抗拉强度从158MPa提升至226.3MPa，弹性模量从45.8GPa提升至53.2GPa。镁锂合金是最轻的金属结构材料，该研究为高性能镁锂基复合材料构件的快速制造提供了一条前瞻性技术路径。

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