钛基非晶钎料真空钎焊TA15钛合金的研究

针对TA15薄壁及蜂窝等复杂结构件设计和焊装的需求,本文采用急冷技术成功制备Ti-Zr28-Cu15-Ni15(1#),Ti-Zr21-Cu20-Ni15(2#)非晶箔带钎料.通过SEM,EDS和XRD等分析测试手段,分析了钎料及钎焊工艺对TA15钛合金钎焊接头界面组织和力学性能的影响.研究结果表明:两种钛基非晶钎料成带性能良好,与相同成分晶态钎料相比,液相线温度降低,熔化温度区间减小.钎料对母材有明显润湿作用,并且2#钎料共晶成分的提高使得其润湿性和非晶形成能力较1#钎料优异.1#钎料对接接头室温拉伸强度在970℃/30min工艺下达到最高325MPa,2#钎料在950℃/30min工艺下接头强度达到最高359MPa,并且其接头力学性能的稳定性较1#钎料要高.对比相同工艺下不同钎料焊缝组织,钎缝均为α+β层片状组织,2#钎料界面处Ti-Cu和Ti-Ni金属间化合物含量较少.

Vacuum brazing TA15 titanium alloy with Ti-based amorphous filler metal

In this paper,Ti-Zr28-Cu15-Ni15(1#) and Ti-Zr21-Cu20-Ni15(2#) amorphous filler metals were prepared by rapidly-cooled equipment in order to join the TA15 titanium alloy honeycomb sandwich panel structures.The joint microstructure and tensile strength was investigated by means of SEM,EDS and XRD etc.The results indicated that both of the fillers perform good forming property.Compared with the conventional fillers,the quenching fillers have lower melting temperature and narrow melting temperature range.Filler metal 2# performs higher wettability and glass forming ability than filler metal 1# due to its high percent of eutectic composition.The tensile strength of the brazed joint reached 325MPa at 970℃ for 30min with filler metal 1#,while the tensile strength of the brazed joint reached 359MPa at 950℃ for 30min with filler metal 2#,and the mechanical stability of the joints is excellent.α+β lamellar structure formed in both joints brazed in the same condition,and smaller amount of Ti-Cu and Ti-Ni intermetallic compounds in the joints brazed with filler metal 2#.