Effect of modified gradient fields on the high-cycle fatigue crack initiation mechanism of Ti6Al4V alloy
Source abstract
Abstract
In this paper, the high-cycle fatigue (HCF) properties and microcrack initiation mechanism of Ti6Al4V alloy after polishing (P) and after polishing followed by the ultrasonic surface rolling process (P + USRP) treatments are investigated. The results indicate that variations in modified gradient fields would alter the crack initiation location and mode. Specifically, after P treatment, the fatigue crack initiation source occurs approximately 205 μm from the surface, owing to localized strain formation within the internal α p /α p grain boundaries under cyclic loading, thereby promoting rapid cleavage at the (0001) twist interface and evolving into microcracks. This result aligns with the crack initiation mechanism of an untreated specimen. Conversely, fatigue crack initiation after P + USRP treatment occurs approximately 425 μm from the surface, as a result of the deeper modified gradient field, where the crack initiation mechanism results from the competing effects of rapid cleavage at the (0001) twist interface of α p /α p and the accumulation of numerous microvoids. The difference in strain between the α and β phases causes the α/β interface to become a weak region of dislocation accumulation, leading to the formation of microvoids induced by microvoid aggregation. Both P and P + USRP are beneficial for improving the fatigue performance of the alloy.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Surface Treatment and Residual Stress · Fatigue and fracture mechanics · High-Velocity Impact and Material Behavior
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (46)
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