TA15钛合金钎焊工艺与接头组织性能研究

Brazing Technology and Joint Properties of TA15 Titanium Alloy

针对TA15钛合金复杂精密构件设计制造可能的需求,采用Ti-21Cu-13Zr-9Ni钎料材料对TA15合金进行了真空钎焊。通过扫描电镜与能谱分析等手段,对钎焊接头界面的元素分布及钎焊接头的组织进行分析;同时测试了接头室温和高温力学性能。实验结果表明:采用Ti-21Cu-13Zr-9Ni钎料钎焊TA15钛合金合理可行;真空钎焊接头通过扩散处理,可以提高接头强度,接头室温和高温拉伸强度分别达到母材的98%和94%;真空钎焊接头脆断于钎缝,扩散处理后的接头韧断于基体。

TAI5 is one kind of near-or type titanium alloy with high aluminum equivalent, which possesses good hot stability the longtime working temperature up to 500℃. TAI5 alloy was vacuum brazed with Ti-21Cu-13Zr-9Ni filler metal. The joint mierostructure and element distribution of joint were analyzed by means of SEM and EDX , at the same time ,and the joint mechanical property testing was performed at the room temperature and high temperature. The results showed that the TAI5 alloy brazed joint could be obtained by using Ti-21Cu-13Zr-9Ni filler metal. The joint tensile strength could be improved by post brazing diffusion treatment. At room temperature and 550℃ , the joint tensile strength reached 98% and 94% of the base material respectively. For the specimens as brazed, brittle fracture was occurred in the joint, while for the specimens were diffusion treated after brazing, ductile fracture occurred in the base metal.