保温时间对置氢TC4真空钎焊界面结构及连接强度的影响

Effects of holding time on interface structure and bonding strength of brazed joint of hydrogenated TC4 titanium alloy

摘要: 采用纯铝箔做中间层,真空连接普通TC4钛合金以及氢的质量分数分别为0.1%,0.3%,0.5%置氢TC4钛合金。利用扫描电镜、X射线衍射分析仪、能谱分析仪对接头界面组织进行分析,并进行接头压剪强度试验。结果表明,当保温时间为45min时,连接接头组织由两层组成;而当保温时间足够长,达到90min时,接头完全由TiAl₃金属间化合物层组成。不同保温时间下接头的抗剪强度有明显的差别,且随保温时间的延长而下降后。而在相同的工艺参数下,置氢TC4钛合金连接强度明显高于普通TC4钛合金。

Abstract: The vacuum brazing of hydrogenated TC4 titanium alloy containing different hydrogen content was carried out with Al brazing filler metal, and the interface structure and bonding strength of the joints were also investigated by means of SEM, XRD, EPMA and a testing machine.The experimental results showed that the interface structure consisted of two layers when the holding time was 45 min, and it only consisted of TiAl₃ when the holding time was 90 min.The bonding stength gradually decreased with the increase of holding time, and the effects of hydrogen on bonding strength of the joints were obvious due to the higher bonding strength of the joints of hydrogenated TC4 alloy.