钛/铝爆炸焊界面形成机制数值模拟与试验验证

Numerical simulation and experimental verification on forming mechanism of Ti/Al explosive welding interface

以爆炸焊制备钛/铝复合板为例,利用数值模拟再现爆炸焊瞬态成形过程,并通过试验分析爆炸焊界面特征。结果表明,由于射流的侵彻作用,沿爆轰波传播方向,钛/铝复合板结合界面由平直结合向波形结合转变。起爆点处压力较小,出现边界效应。爆炸焊撞击区极高的碰撞压力,是促使界面产生塑性变及晶粒细化的原因。高速冲击导致爆炸焊界面缺陷增多,这为原子的扩散提供了通道,从而使钛、铝在界面产生互扩散,实现冶金结合。数值模拟结果与试验结果相吻合,揭示了钛/铝爆炸焊界面的形成机制。

Taking Ti/Al composite plate prepared by explosive welding as an example, the transient forming process of explosive welding was reproduced by numerical simulation, and the interface characteristics of explosive welding were analyzed by experiments. The results showed that interface morphology of Ti/Al composite plate changed from flat bonding to wave bonding along the propagation direction of detonation wave due to the penetration of jet. The lower pressure at the initiation point led to the boundary effect of explosive welding. The high impact pressure in the impact zone of explosive welding was the cause of plastic deformation and grain refinement near the interface. The interface defects of ex-plosive welding were increased by high velocity impact, which provided a channel for the diffusion of atoms and realized metallurgical bonding.The results of numerical simulation were consistent with the experimental results, which revealed the forming mechanism of Ti/Al explosive welding interface.