一种铝锂合金搅拌摩擦焊接头力学性能及微观组织研究
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中南大学材料科学与工程学院

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Mechanical Property and Microstructure of Friction Stir Welding ( FSW)Joint of an Al-Li Alloy
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    摘要:

    研究了C24S-T8 铝锂合金搅拌摩擦焊接头力学性能及微观组织。通过焊接工艺参数的优化,获
    得了无孔洞缺陷、焊缝质量优异的接头,强度系数约82%。拉伸时塑性变形及断裂集中于焊缝处。基材晶粒
    呈薄饼状,沿轧制方向拉长;焊核区为细小等轴的再结晶晶粒,平均晶粒尺寸约2. 3 μm,大部分晶界是大于15°
    的大角度晶界;热机影响区的晶粒在焊接过程中发生了偏转和变形。C24S-T8 铝锂合金基材强化相包括T1 相
    (Al2CuLi)、θ′相(Al2Cu)和S′相(Al2CuMg);热机影响区及焊核区内强化相完全溶解,造成硬度下降。

    Abstract:

    Mechanical properties and microstructures of FSW joint of C24S-T8 Al-Li alloy were investigated.
    The strength coefficient of the joint welded with optimized technical parameters reached 82%. During the tensile
    process, plastic deformation and fracture were concentrated in the weld. The nugget zone possessed fine recrystallized
    equiaxed grains with an average size of about 2. 3 mm, most grain boundaries were of high angle larger than 15 °. The
    grains of the thermomechanically affected zone underwent deflection and deformation during the welding process. The
    strengthening precipitates of C24S-T8 Al-Li alloy consisted of T1(Al2CuLi), θ′(Al2Cu) and S′(Al2CuMg). In the
    thermomechanically affected zone and nugget zone, these precipitates were completely dissolved, leading to the decrease
    in hardness.

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李劲风.一种铝锂合金搅拌摩擦焊接头力学性能及微观组织研究[J].宇航材料工艺,2013,43(3).

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  • 在线发布日期: 2016-11-28
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