稀土镧钕对Ti15Cu15Ni钎料硬度及TC4接头抗剪强度的影响

在Ti15Cu15Ni钎料合金基础上添加微量稀土镧钕，以应用普遍的TC4为母材，研究稀土镧钕添加量对钎料合金及钎焊接头性能的影响.结果表明，稀土相分布于α-Ti及金属间化合物的相界，阻碍位错运动，使钎料硬度增加，在稀土含量为1%时达到最大40HRC.稀土镧钕对Ti15Cu15Ni抗剪强度具有较大影响，稀土含量小于0.5%时，抗剪强度随稀土含量增加而增加；稀土含量大于0.5%时，随着稀土含量增加，钎料合金抗剪强度呈下降趋势.当稀土含量等于0.5%时，抗剪强度达到最大为244.55 MPa.

Effect of rare earth element (La,Nb) on hardness of Ti15Cu15Ni filler metal and shear strength of TC4 joint

The effect of rare earth on the Ti15Cu15Ni brazing filler alloys and the properties of joints brazed with the widely-used TC4 was studied by adding small-amount of LaNd to Ti15Cu15Ni. The results indicate that RE phases are distributed on the boundaries between α-Ti and intermetallic phases, which improves the hardness of brazing filler alloys by hindering the movement of dislocations. When the content of RE is 1%, the hardness reaches to the maximum of 40 HRC. The RE content has large effect on the shear-strength, when the content of RE is under 0.5%. The strength increases with the increase of RE, when the content of RE is higher than 0.5%. The strength decreases with the increasing of RE. When the content of RE is exactly 0.5%, the shear-strength reaches a maximum of 244.55 MPa.