|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Real Time Imaging
||Three-dimensional Time Evolution Behavior of Short Fatigue Crack Morphology and Crack Closure in Ti-6Al-4V Alloy Assessed Using High-energy Imaging Type CT
||Valary Tubei, Hiroyuki Toda, Akihisa Takeuchi, Masayuki Uesugi
|On-Site Speaker (Planned)
High-energy imaging type CT technique was utilized to locally observe the three-dimensional (3D) time evolution behavior of a short fatigue crack and crack closure in Ti-6Al-4V alloy. The microstructure, 3D crack morphology together with the occurrence of crack closure were readily visualized at a spatial resolution level of 130 nm attained in this study. The highly torturous 3D cracks were due to crack interaction with the heterogenous 3D local microstructural features. These complex crack morphologies consisted of deflections, facet paths and overlapped/branched crack. It was elucidated that these different crack path morphologies with varied extents of crack surface roughness and plastic deformation at the crack tips control the closure behavior along the crack front. With crack growth, crack tilting and twisting with respect to the overall crack growth direction were observed in some locations along the crack front which influenced the crack closure behavior and subsequently the crack growth rate.
||Characterization, Mechanical Properties, Titanium