LaNd对Ti-13Zr-21Cu-9Ni钎料铺展性及TC4接头性能的影响

为了优化Ti-13Zr-21Cu-9Ni钎料性能、获得一种性能优良的Ti合金接头，向Ti-13Zr-21Cu-9Ni钎料中添加了稀土元素LaNd. 以应用普遍的TC4合金为母材，通过真空炉、场发射扫描电镜、X射线衍射仪等设备研究了稀土元素LaNd对Ti-13Zr-21Cu-9Ni钎料铺展性能及TC4接头性能的影响. 结果表明，随着LaNd添加量的增加，Ti-13Zr-21Cu-9Ni-xLaNd钎料的铺展面积和Ti-13Zr-21Cu-9Ni-xLaNd/TC4钎焊接头的抗剪强度先增大后减小. 当LaNd添加量为0.3%时，Ti-13Zr-21Cu-9Ni-xLaNd钎料铺展面积最大，最大值为0.74 cm2，较基体提高了88.8%；当LaNd添加量继续增加时，生成的Cu₅La相会使钎料的铺展性能大幅降低. Ti-13Zr-21Cu-9Ni-xLaNd/TC4钎焊接头抗剪强度在LaNd添加量为0.3%时达到最大值，为157.1 MPa，较基体提高了45.2%. LaNd的最佳添加量应该为0.3%.

Effect of LaNd on the spreadability of Ti-13Zr-21Cu-9Ni brazing fillers and the properties of TC4 joint

In order to optimize the properties of Ti-13Zr-21Cu-9Ni brazing fillers and obtain a good performance Ti alloy joint, rare earth element LaNd was added to Ti-13Zr-21Cu-9Ni brazing fillers. The commonly used TC4 alloy was used as the mother The effect of rare earth element LaNd on the spreading performance of Ti-13Zr-21Cu-9Ni brazing fillers and the performance of TC4 joints was studied by vacuum furnace, field emission scanning electron microscope, X-ray diffractometer and other equipment. The results showed that the spread area of Ti-13Zr-21Cu-9Ni-xLaNd brazing fillers and the shear strength of Ti-13Zr-21Cu-9Ni-xLaNd/TC4 brazed joints first increased and then decreased with the addition of LaNd increased. When the LaNd addition is 0.3%, Ti-13Zr-21Cu-9Ni-xLaNd brazing fillers has the largest spreading area, the maximum value is 0.74 cm2, which is 88.8% higher than the matrix; when the addition of LaNd continues to increase, the formed Cu₅La phase greatly reduce the spreading performance of the brazing fillers. Ti-13Zr-21Cu-9Ni-xLaNd/TC4 brazed joint shear strength reaches the maximum when the LaNd addition is 0.3%, which is 157.1 MPa, which is 45.2% higher than the matrix. Therefore, the optimal addition of LaNd It should be around 0.3%.