Microstructure of Adiabatic Shear Bands in the TC4 Titanium Alloy Induced by High-Speed Projectile Impact

作者：Yang Shen; Zhang Conglin; Huang Wei; Cai Jie; Guan Qingfeng^*

来源：Rare Metal Materials and Engineering, 2016, 45(9): 2307-2312.

• TC4 titanium alloy
• high-speed projectile impact
• adiabatic shear bands (ASBs)
• microstructure

TC4 titanium alloy plates were impacted by projectile at a high speed. The microstructure changes inside and nearby the adiabatic shear bands (ASBs) were observed by transmission electron microscope (TEM). The microstructure observation nearby the ASBs indicates that the boundaries of the ASBs may be the origin for the crack initiation. High stress is concentrated nearby the ASBs, and thus it is easy to form high density dislocation configurations (such as tangled dislocations and banded dislocation cells) and stress induced martensite. The microstructure observation inside the ASBs reveals that they are mainly induced by high stress. Along the direction vertical to the ASBs, the closer to the center of the ASBs, the more serious the grain fragmentation is. The typical characteristics of dynamic recrystallization (DRX) are not found in the ASBs; as a result, the present observations do not support the traditional viewpoints that DRX occurs in the ASBs and the origin and dissemination of the ASBs are related to the DRX. Besides, amorphous is also found in the center of the ASBs.

• 出版日期2016-9
• 单位江苏大学