超声固结钛/铝箔材界面剥离强度与结合机理分析

Analysis of the peel strength and bonding mechanism of Ti/Al foil interface using ultrasonic consolidation process

摘要:

以1100铝箔和TA1钛箔为基体材料进行异种金属材料超声固结试验研究，制备了Ti/Al箔材金属层状复合材料试样，应用剥离试验研究了振幅、静压力对Ti/Al箔材界面结合强度的影响规律，利用扫描电镜研究了剥离界面的微观组织形貌，采用EDS对剥离界面进行能谱分析，通过透射电镜对Ti/Al箔材界面微观组织进行观察。结果表明，超声固结可以实现Ti/Al箔材良好的结合界面，界面结合强度随着静压力的增大先增大后减小，随着振幅的增大单调递增；在振幅35μm，静压力1.5kN条件下，获得最佳的超声固结界面，其剥离强度为11.325N/mm；Ti箔材的剥离界面中Al元素均匀分布，并存在明显的韧窝组织；Ti/Al界面存在元素过度区，界面处晶粒细化明显；铝箔表面氧化膜破碎，且钛元素以弥散的形式嵌入到铝晶粒内部。

Abstract:

Experimental investigations on the ultrasonic consolidation of different1 materials were performed using 1100 aluminium and TA1 titanium foils as matyix materials. The layer-metal composite laminate specimens were prepared using the ultrasonic consolidated Ti/Al foil, which were used to investigate effects of amplitude and static force on the interface bonding strength of Ti/Al foil by peel test. In addition, the microstructure morphology observation and energy spectrum analysis of the peeled interfaces were performed using SEM and EDS respectively. Microstructure of Ti/Al foil interface was observed using TEM. The results have shown that a good bonding interface of Ti/Al foil can be obtained using the ultrasonic consolidation technique. The interface bonding strength increased first then decreased with increasing the static force, while increasing monotonically with increasing the amplitude. The optimum ultrasonic consolidated interface with a peeling strength 11.325 N/mm can be obtained using an amplitude 35 um and static force 1.5kN. A uniform distribution of Al element can be found in the peeled interface of Ti foil accompanying with the obvious nest microstructure. Element transition zone existed at the Ti/Al interface. Recrystallisation was obvious at the interface resulting in fine grains. The oxidation layer on the Al foil was broken, and titanium element penetrate Al grains uniformly.