Shock-induced mechanical response and spall fracture behavior of an extra-low interstitial grade Ti-6Al-4V alloy
Shock-induced mechanical response and spall fracture behavior of an extra-low interstitial grade Ti-6Al-4V alloy
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DOI：
10.1016/j.msea.2013.04.080
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发表时间：
2013-08-20
期刊：
影响因子：
6.4
通讯作者：
Cai, Hongnian
中科院分区：
文献类型：
--
作者：
Ren, Yu;Wang, Fuchi;Cai, Hongnian
系统研究了超低间隙原子（ELI）Ti-6Al-4V合金在一维冲击载荷作用下的力学响应和层裂断裂行为。通过与工业Ti-6Al-4V的对比，揭示了氧含量对Ti-6Al-4V冲击响应和动态失效特性的影响。Ti-6Al-4V ELI的Hugoniot弹性极限（HEL）低于商业Ti-6Al-4V。而Ti-6Al-4V ELI的冲击参数拟合值和冲击应力-粒子速度空间的Hugoniot实测值与商用Ti-6Al-4V几乎一致。这些结果表明，氧含量可以显着影响Ti-6Al-4V的HEL，但很少或没有影响该合金的冲击响应超出HEL。冲击后Ti-6Al-4V ELI在准静态和动态压缩试验期间未显示冲击诱导强化。透射电子显微镜（TEM）分析表明，高密度位错或位错胞的缺乏限制了冲击诱导强化效应，虽然位错增殖和缠结导致增加的屈服强度和应变硬化率的再加载材料。最后，Ti-6Al-4V ELI被证明以延性方式剥落，并且在不同冲击载荷条件下具有与商业Ti-6Al-4V相似的剥落强度。氧含量对Ti-6Al-4V的层裂断裂方式没有影响，但降低氧含量可使该合金承受更多的微观损伤。(c)2013 Elsevier B. V.保留所有权利。
The mechanical response and spall fracture behavior of an extra-low interstitial (ELI) grade Ti-6Al-4V alloy are systemically investigated during one-dimensional shock loading. The effects of oxygen content on the shock response and dynamic failure characteristic of Ti-6Al-4V are also shown through the comparison of the obtained results with those for commercial Ti-6Al-4V. The measured Hugoniot elastic limit (HEL) of Ti-6Al-4V ELI is lower than that of commercial Ti-6Al-4V. While the fitted shock parameters and the measured Hugoniot in the stress-particle velocity space of Ti-6Al-4V ELI are found to be almost identical to those of commercial Ti-6Al-4V. These results indicate that the oxygen content can significantly affect the HEL of Ti-6Al-4V, but has little or no influence on the shock response of this alloy beyond the HEL. The postshock Ti-6Al-4V ELI does not display shock-induced strengthening during quasistatic and dynamic compression tests. Transmission electron microscopy (TEM) analyses reveal that the lack of high density dislocations or dislocation cells limits the shock-induced strengthening effect, although dislocation multiplication and tangles lead to increased yield strength and strain hardening rate of the reloaded material. Finally, Ti-6Al-4V ELI is demonstrated to spall in a ductile manner, and has similar spall strengths to those of commercial Ti-6Al-4V under different shock loading conditions. The oxygen content exerts no effect on the spall fracture manner of Ti-6Al-4V, although reducing the oxygen content enables this alloy to endure more micro-damages. (c) 2013 Elsevier B.V. All rights reserved.