双模态Ti-6Al-4V合金停留疲劳裂纹尖端变形及其与裂纹/断口形貌的关系

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Transactions Pub Date : 2023-12-01 DOI:10.2320/matertrans.mt-m2022076

Yuma Aoki, M. Koyama, Masaki Tanaka, K. Tsuzaki

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引用次数: 0

摘要

研究了疲劳载荷对双模态Ti - 6Al - 4valley裂纹扩展的加速作用。编制了疲劳试验程序，只包括在几K下进行一个周期的位移保持。结果表明:(1)裂纹尖端应变在保持位移过程中发生演化;(2)保持位移使疲劳条纹间距增大;(3)保持位移过程中的应变增量与保持位移-扩展条纹间距呈线性相关。这说明静载有助于裂纹的扩展，加速了裂纹的扩展。本文还从裂纹扩展模式、裂纹闭合和位错结构等方面给出了分析结果和讨论。[doi:10.2320 / matertrans.]MT-M2022076]

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Crack Tip Deformation during Dwell Fatigue and Its Correlation with Crack/Fracture Surface Morphologies in a Bi-Modal Ti–6Al–4V Alloy

We investigated how dwell fatigue loading accelerates the crack propagation in bi-modal Ti 6Al 4Valloy. A fatigue test was programmed to include displacement holding for only one cycle at several ¦ K . We found (1) crack tip strain evolved during the displacement holding, (2) the displacement holding increased fatigue striation spacing, and (3) the strain increment during the displacement holding was linearly correlated with spacing of the displacement-holding-extended striations. These facts indicate that the dwell loading assisted crack opening, which accelerated the crack propagation. Other analyses results and discussion are also presented, in terms of crack propagation mode, crack closure, and dislocation structure. [doi:10.2320 / matertrans.MT-M2022076]

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