钛合金/纯铝异种金属摩擦焊接工艺

进行了TC4钛合金与L5纯铝异种金属的摩擦焊接工艺及其焊后回火热处理工艺研究,利用光学金相分析、扫描电镜EDX线扫描、拉伸性能及硬度的测试,探讨了TC4钛合金与L5纯铝异种焊接接头焊合区的微观组织及其力学性能.研究表明,T℃4钛合金与L5纯铝间具有良好的摩擦焊接性,焊合区无金属间化合物相生成,焊接接头强度等于或高于铝基材.经焊后回火热处理,摩擦焊接头两侧主要合金元素的扩散区宽度增大,焊合区钛合金侧的硬度值因时效作用而有所提高.

Friction welding technology between titanium alloy and pure aluminum

Titanium alloy and aluminum alloy are good for the structure materials in the fields of aerospace and aviation because of their excellent properties.It is necessary to join these two materials for wider applications.TC4 titanium alloy and L5 pure aluminum are joined by friction welded and then post-welding tempering treatment have been conducted.By means of the optical microscope detecting,EDX analysis,micro-sclerometer and tensile test,we explore experimentally the microstructure characteristics and diffusion behavior of the friction welded joint of TC4 titanium alloy and L5 pure aluminum.As expected,there are good friction weldability between TC4 titanium alloy and L5 pure aluminum and no intermetallic phases created in friction welding zone under the welding parameters used in this trial.Furthermore,the tensile strength of the welded joint exceeds that of the base metal aluminum.After post-welding heat treatment,the diffusion zone of main alloying elements Ti,Al and V widens and the microhardness of the friction welded joints near titanium increases greatly because of the aging effect.