TiAl合金与高温合金的扩散焊接头组织及性能

Microstructures and Property of Diffusion Bonded Joints Between TiAl Alloy and Two Kinds of Superalloys

采用直接扩散焊和加中间层的扩散焊方法进行了TiAl合金和高温合金异种材料组合的连接实验。在1000℃/20MPa/1h规范下直接扩散焊获得的TiAl/GH2036接头组织中存在大量未焊合的孔洞,接头室温剪切强度平均值仅有16MPa。采用Ti-Zr-Cu-Ni合金作为中间层在935℃加压3MPa保温10min和1h进行了TiAl/GH3536组合接头的液相扩散焊,获得的扩散焊缝中含有Ti3Al,NiTi等多种物相,中间层合金与两侧母材发生作用形成了具有一定厚度的反应层。在935℃/3MPa/1h规范下获得了与两侧母材结合良好的无缺陷扩散焊接头,室温剪切强度达到125MPa。

Joining TiA1 alloy and superalloy was carried out by diffusion bonding with and without interlayer. There existed many holes in the TiA1/GH2036 joint under the diffusion bonding condition of 1000°C/20MPa/lh, and the average shear strength of joint at room temperature was only 16MPa. Using Ti Zr-Cu-Ni alloy as the interlayer, liquid-phase diffusion bonding between TiA1 and GH3536 was investigated at 935°C holding 10min and lh under the pressure of 3MPa. The joints diffusion boned under the two conditions were composed by multiple phases, such as TiaA1 and NiTi. As a result of the reaction between the interlayer and two base metals, two reaction layers with a certain thickness appeared in the both interface respectively. Sound joint was obtained under the diffusion bonding condition of 935°C/3MPa/lh, and the interlayer alloy exhibited strong cohesion with TiA1 and GH3536. The corresponding shear strength of joint reached 125MPa.