TC6钛合金动态断裂机制

Dynamic Fracture Mechanism of TC6 Titanium Alloy with Binary Morphologies

摘要:

采用分离式Hopkinson Bar系统，对双态组织的TC6钛合金帽形试样进行动态力学试验，研究其动态断裂失效机制。结果表明：双态组织TC6钛合金在动态下变形时，其断裂常与绝热剪切带相联系，且断裂由微孔洞形核、孔洞长大形成微裂纹、微裂纹长大扩展形成宏观断裂3个过程组成

关键词:TC6钛合金;双态组织;高应变率;断裂机制

Abstract:

Using the technology of split Hopkinson bar, dynamic mechanical experiments under high strain-rate loading on hat-shape samples of TC6 titanium alloy with binary structure have been conducted and the fracture failure mechanism has been investigated. It is shown that the fracture of TC6 titanium alloy with binary structure is often related to adiabatic shear band when deformed at the high strain rate. Its fracture includes three stages, i.e. nucleation of voids, growth of voids to form micro-crack and expansion of the micro-crack to form fracture

Key words:TC6 titanium alloy; binary morphology; high strain rate; fracture failure mechanism