Dynamic deformation and adiabatic shear microstructures associated with ballistic plug formation and fracture in Ti-6Al-4V targets
Dynamic deformation and adiabatic shear microstructures associated with ballistic plug formation and fracture in Ti-6Al-4V targets
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DOI：
10.1016/j.msea.2006.11.097
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发表时间：
2007-04-25
期刊：
影响因子：
6.4
通讯作者：
Gaytan, S. M.
中科院分区：
文献类型：
--
作者：
Martinez, F.;Murr, L. E.;Gaytan, S. M.
圆柱形、平头、4340钢质射弹（高度2.0厘米）以633米/秒至1027米/秒的速度撞击到厚度为2.5（单位不明，可能是厘米等）的Ti - 6Al - 4V靶材上。在633米/秒时可观察到冲塞现象形成，并在1006米/秒至1027米/秒之间从靶材穿出。由动态再结晶（DRX）晶粒组成的绝热剪切带（ASB）以及裂纹在垂直和水平方向（平行或垂直于）撞击轴形成。绝热剪切带特有的白色带状物厚度从5微米到40微米不等，在最高撞击速度下出现较厚的带状物。随着撞击速度的增加，绝热剪切带和裂纹的频率增加，形成了一种表征冲塞的圆柱状流动区域。透射电子显微镜（TEM）分析表明，构成绝热剪切带的动态再结晶区域减少了一个数量级以上，而电子背散射衍射（EBSD）分析显示剩余的动态再结晶晶粒尺寸区域从50纳米到900纳米不等。没有证据表明在绝热剪切带/动态再结晶区域内发生了α→β转变。（c）2006爱思唯尔有限公司。保留所有权利。
Cylindrical, flat-nose, 4340 steel projectiles (2.0 cm height) were impacted onto Ti-6Al-4V targets (2.5 thick) at velocities ranging from 633 to 1027 m/s. Plug formation was observable at 633 m/s and exited the target between 1006 and 1027 m/s. Adiabatic shear bands (ASBs) composed of dynamically recrystallized (DRX) grains and cracks formed both vertically and horizontally (parallel or perpendicular) to the impact axis. The ASB characteristically white-band thickness varied from 5 to 40 mu m, with the thicker bands occurring at the highest impact velocity. ASBs and cracks increased in frequency with increasing impact velocity, forming a cylindrical flow regime characterizing the plug. TEM analysis showed a greater than order of magnitude decrease in the DRX regime composing the ASBs, while EBSD analysis showed a residual DRX, grain-size regime varying from 50 to 900 nm. There was no evidence for an alpha -> beta transformation occurring within the ASB/DRX regime. (c) 2006 Elsevier B.V. All rights reserved.