Micro-Mechanisms of Shear Deformation Localization of Ti6Al4V Alloy under Shear-Compressive Loading Conditions.
Micro-Mechanisms of Shear Deformation Localization of Ti6Al4V Alloy under Shear-Compressive Loading Conditions.
复制标题
Ti6Al4V合金剪压加载条件下剪切变形局部化的微观机制
DOI：
10.3390/ma13245646
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发表时间：
2020-12-10
期刊：
影响因子：
--
通讯作者：
Ma W
中科院分区：
文献类型：
--
作者：
Li L;Jin T;Shuang F;Li Z;Wang Z;Ma W
钛Ti6 Al 4 V合金是一种上级材料，具有极高的强度、硬度和良好的耐腐蚀性。对该合金进行了动态剪切-压缩实验，研究了绝热剪切带（ASB）形成的微观机制。采用分离式霍普金森压杆（SHPB）装置进行了高应变率下的试验。结果表明，复杂的加载条件对剪切变形局部化有很大的影响。ASB形成的微观机制取决于不同的剪切压缩比。扫描电子显微镜（SEM）观察表明，ASB宽度与SCLP有关，合金断裂失效是由微孔的形核和长大引起的。在透射电子显微镜（TEM）分析中，材料的微观结构的变化，其特征在于动态再结晶（DRX）和孪晶的形成，位错迁移，堆叠和晶粒细化过程。本文的研究结果显示了合金在剪切局部化过程中组织演变的复杂图像。
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.
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