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Micro-Mechanisms of Shear Deformation Localization of Ti6Al4V Alloy under Shear-Compressive Loading Conditions

机译：剪切压缩负载条件下Ti6Al4V合金剪切变形定位的微机制

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摘要

Titanium Ti6Al4V alloy is a superior material that has extremely high strength, hardness and good anti-corrosion resistance. Dynamic shear-compression experiments were carried out on the alloy to investigate the micro-mechanisms of adiabatic shear banding (ASB) formation. The split Hopkinson pressure bar (SHPB) setup were used for the tests at high strain rates. It was found that the shear deformation localization (SDL) was considerably affected by the complex loading conditions. The micro-mechanisms for the ASB formation relied on different shear compressive proportion of loadings (SCLPs). Scanning electron microscope (SEM) observations showed that the ASB width was related with the SCLP and the fracture failure of alloy was induced by the nucleation and growth of microvoids. In transmission electron microscope (TEM) analysis, the microstructural changes of material within the ASB were characterized by dynamic recrystallization (DRX) and twining grain formation, dislocation migration, and stacking and grain refining processes. The results in this article demonstrates a complex image of microstructural evolution of alloy in the shear localization process.
机译：钛Ti6Al4V合金是一种优异的材料，具有极高的强度，硬度和良好的防腐蚀性。在合金上进行动态剪切 - 压缩实验，以研究绝热剪切带（ASB）形成的微机制。分裂霍普金森压力条（SHPB）设置用于高应变率的测试。发现剪切变形定位（SDL）受到复杂的负载条件的显着影响。 ASB形成的微机制依赖于不同的剪切压缩比例的负载量（SCLP）。扫描电子显微镜（SEM）观察结果表明，ASB宽度与SCLP有关，并通过微核的成核和生长诱导合金的断裂衰竭。在透射电子显微镜（TEM）分析中，通过动态重结晶（DRX）和缠绕晶粒形成，脱位迁移和堆叠和晶粒精制过程，表征ASB内材料的微观结构变化。本文中的结果表明了剪切定位过程中合金微观结构演化的复杂图像。

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