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首页> 外文期刊>Materials Science and Engineering >Nano-indentation and in-situ investigations of double-sided laser beam welded 2060-T8/2099-T83 Al-Li alloys T-joints
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Nano-indentation and in-situ investigations of double-sided laser beam welded 2060-T8/2099-T83 Al-Li alloys T-joints

机译：双面激光束焊接2060-T8 / 2099-T83 Al-Li合金T型接头的纳米压痕和原位研究

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摘要

2060 and 2099 are both newly developed high-strength aluminum-lithium (Al-Li) alloys for fuselage panels of jetliners. In this work, double-sided laser beam welding of 2-mm-thick 2060-T8 and 2099-T83 Al-Li alloys was performed using AA4047 filler wire under optimized parameters. Weld zone microstructure and T-joint mechanical properties were investigated by means of scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), nano-indentation and in-situ tensile test. Experimental results indicated that the equiaxed grain zone (EQZ) featured by dense large-angle (theta 10 degrees) grain boundaries was observed in the weld zone along the fusion lines. Besides the softening problem found in the partially melted zone (PMZ), local softening phenomenon was detected in the local enrichment region of the EQZ. During in-situ tensile tests, the crack was initiated at the weld toe and then propagated alternately in the PMZ and EQZ's local enrichment regions. Micro-voids induced the localized softening problem and the cracks intergranular expansion in the EQZ. Localized absence of silicon was most likely to cause continuous micro-voids in the EQZ.
机译：2060和2099都是新开发的用于喷气机机身面板的高强度铝锂（Al-Li）合金。在这项工作中，使用AA4047填充焊丝在优化的参数下对2-mm厚的2060-T8和2099-T83 Al-Li合金进行了双面激光束焊接。通过扫描电子显微镜（SEM），电子背散射衍射（EBSD），纳米压痕和原位拉伸试验研究了焊接区的组织和T型接头的力学性能。实验结果表明，在沿熔合线的焊缝区域观察到以致密的大角度（θ> 10度）晶界为特征的等轴晶粒区（EQZ）。除了在部分熔融区（PMZ）中发现软化问题外，还在EQZ的局部富集区域中检测到局部软化现象。在原位拉伸试验中，裂纹在焊趾处开始，然后在PMZ和EQZ的局部富集区交替扩展。微孔引起了EQZ中的局部软化问题和裂纹的晶间膨胀。局部缺乏硅最有可能在EQZ中引起连续的微孔。

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  • 来源
    《Materials Science and Engineering》 |2019年第22期|291-301|共11页
  • 作者

    Chen Xi; Lei Zhenglong; Chen Yanbin; Han Bing; Jiang Meng; Tian Ze; Bi Jiang; Lin Sanbao;

  • 作者单位

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Al-Li alloys; Double-sided laser beam welding; Equiaxed zone; Nano-indentation; In-situ tensile test;

    机译：铝锂合金;双面激光焊接;等温区;纳米压痕;原位拉伸试验;

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