摘要: |
LZ91镁锂合金是一种具有超低密度和优良塑性的结构材料。本文中LZ91镁锂合金板材在不同激光焊接工艺参数下连接。在不同温度(250 ℃、300 ℃)和应变速率(5×10-4s-1、1×10-3s-1)条件下进行单向拉伸试验,研究分析其流动应力和延伸率的变化规律,确定激光焊接LZ91镁锂合金的最佳成形条件:成形温度为300 ℃,应变速率为5×10-4s-1,激光焊接功率为940 W,焊接速度为1800 mm/min。针对超塑胀形成形方法进行模具设计和宏观有限元模拟,并通过超塑胀形试验验证激光焊接LZ91镁锂合金具有良好的成形性能。 |
关键词: 镁锂合金;激光焊接;超塑成形;有限元模拟 |
基金项目:国防基础科研(JCKY20****0B012) |
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Research on Laser Welding and Superplastic Properties of LZ91 Mg-Li Alloy |
Shen Shijun Luan Hao Qi Haiyan Li Lei Cao Yi
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Shanghai Aerospace Equipment Manufacturer, Shanghai 200245
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Abstract: |
LZ91 magnesium-lithium alloy is a structural material with ultra-low density and excellent plasticity. In this paper, LZ91 magnesium-lithium alloy plates are joined under different laser welding parameters. Uniaxial tensile tests were carried out at different temperatures (250 ℃, 300 ℃) and strain rates (5×10-4s-1, 1×10-3s-1), and the variation rules of flow stress and elongation were analyzed. The optimal forming condition for laser welding LZ91 magnesium-lithium alloy were determined as follows: the forming temperature is 300 ℃, the strain rate is 5×10-4s-1, the laser welding power is 940 W, and the welding speed is 1800 mm/min. The die design and macro finite element simulation for superplastic bulging were established, and the laser beam welded LZ91 magnesium-lithium alloy has good formability through superplastic bulging test. |
Key words: Mg-Li alloy;laser welding;superplastic forming;finite element simulation |