TiAl与TC4扩散焊接接头的组织与性能

摘要

主要对TiAl基金属间化合物与TC4的扩散连接技术进行了研究.通过对钛铝基合金进行热处理,获得了高温性能良好的全片层组织；通过对扩散连接后的接头进行组织结构、力学性能和断口的分析发现,在915℃/80 MPa/1 h的扩散连接条件下,TiAl基合金与TC4实现了冶金结合,在室温、400和500℃下,接头的抗拉强度分别达到了TiAl母材的91.77％、95.27％和99.21％.%TiAl alloy was prepared using hot isostatic pressing process and the fully lamellar microstructure was achieved via heat treatment.Then the diffusion bonding of TiAl and TC4 was invetigated.By the analysis of the microstructure,mechanical property and fracture surface,it is found that TiAl alloy and TC4 alloy can be jointed well under the conditions of 915℃/80 MPa/1 h,and the joint achieves metallurgical combination.The joint part appears both TiAl lamellar and TC4 rolling stripe.Strength of some joints exceeds the TiAl substrate.At room temperature,400℃and 500℃,the joint tensile strength reaches 91.77％,95.27％ and 99.21％ of the TiAl substrate,respectively.