Room-temperature low-fatigue tests were conducted on TC17 titanium alloy, and the low-fatigue damage behavior of TC17 titanium alloy with a basket-weave microstructure at room temperature was investigated. The results show that TC17 titanium alloy exhibits different cyclic hardening/softening phenomena at different strain amplitude () levels, which was closely related to the magnitude of strain amplitude, the crack sources of all specimens generated on the surface, and the number of crack sources increases with the increase of strain amplitude level. The competitive relationship between back stress hardening and frictional stress softening caused by changes in different microstructures is the reason for the occurrence of different cyclic hardening/softening phenomena. The relationship between the holes and secondary cracks near the fracture surface and the basket-weave microstructure was further discussed. The secondary cracks/holes were more likely to initiate in the primary α phase where the solid solution strengthening effect was weak. In addition, the interaction between the secondary crack propagation path and the nearby α lamellae was studied by the Electron Backscatter Diffraction (EBSD) method.

中文翻译：

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篮纹组织TC17钛合金低疲劳损伤行为研究


对TC17钛合金进行了室温低疲劳试验，研究了篮纹组织TC17钛合金的室温低疲劳损伤行为。结果表明，TC17钛合金在不同应变幅()水平下表现出不同的循环硬化/软化现象，这与应变幅的大小、所有试件表面产生的裂纹源以及裂纹源的数量密切相关。随着应变幅度水平的增加而增加。不同微观组织变化引起的背应力硬化和摩擦应力软化之间的竞争关系是出现不同循环硬化/软化现象的原因。进一步讨论了断裂面附近的孔洞和二次裂纹与网篮组织之间的关系。二次裂纹/孔洞更容易在固溶强化作用较弱的初生α相中萌生。此外，还通过电子背散射衍射（EBSD）方法研究了二次裂纹扩展路径与附近α片层之间的相互作用。