LaNd 对Ti-13Zr-21Cu-9Ni钎料铺展性及TC4接头性能的影响

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

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%.

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-9NixLaNd/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%.