Ti3Al基合金瞬间液相扩散连接接头组织与力学性能
Microstructures and mechanical properties of transient liquid phase bonded Ti3Al based alloy joints
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摘要: 采用TiZrNiCu合金作为中间层材料研究了Ti3Al基合金的瞬间液相扩散连接,采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)及电子万能试验机研究了接头的组织结构与力学性能.结果表明,采用TiZrNiCu作为中间层可以实现Ti3Al基合金的TLP扩散连接,能形成完整的接头.较高的连接温度和较长的连接时间有利于获得成分和组织较为均匀的接头.随着连接温度的提高和连接时间的延长,接头连接区宽度增大,反应层数量减少.当连接温度为900℃,连接时间为60 min时,接头组织主要为钛固溶体,Ti3Al和Ti2Cu.接头抗剪强度最高,可达420.1 MPa.Abstract: Microstmcture and mechanical properties of Ti3Al based alloy joints bonded by transient liquid phase bonding were studied by scanning electron microscope (SEM) ,energy dispersive X-ray spectroscope (EDS) ,X-ray diffraction (XRD) and universal test machine.The results show that the integrated joints were prepared by TLP bonding with the TiZrNiCu alloy in-terlayer.The high bonding temperature and long bonding time help to obtain the joints with uniform composition and microstruc-ture.With bonding temperature and bonding time increasing,the width of the bonding zone increases and reaction zones decrea-ses.When bonding time is 60 min at bonding temperature of 900℃,the joint microstructure consists of Ti solid solution,Ti3Al and Ti2Cu and the joint strength of 420 MPa can be obtained.
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