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dc.contributor.authorHochhalter, Jacob
dc.date.accessioned2014-11-03T14:30:00Z
dc.date.available2014-11-03T14:30:00Z
dc.date.issued2014-09-27
dc.identifier.urihttps://hdl.handle.net/1813/38091
dc.descriptionJacob Hochhalter, PhD ‘10en_US
dc.descriptionMaterials Research Engineer, Durability and Damage Tolerance Branch, NASA Langley Research Center
dc.description.abstractMicrostructural features significantly influence fatigue crack growth, particularly during the early stages of initiation and growth, which can account for the majority of life. In the present study, high-resolution X-Ray micro computed tomography (uCT) is used to study the influence that individual copper-rich segregation (CRS) structures have on microstructurally-small fatigue-crack (MSFC) propagation. Several single-crystal specimens of Al-Cu are fabricated and heat-treated to produce specific CRS structures, where their density and distribution are varied. By observing the crack propagation path and interaction with the CRS structures periodically using X-Ray uCT, the mechanisms governing how such features influence the early stages of crack growth are examined. With the capability to control the density and distribution of the copper segregation structures relative to loading direction, design of optimal copper segregation structures to decelerate MSFC growth rates by producing tortuous crack paths to maximize closure is proposed.en_US
dc.language.isoen_USen_US
dc.publisherThe Internet-First University Pressen_US
dc.title(21) X-Ray Micro Computed Tomography Based Study of the Effects of Copper-Rich Segregation Structures on Microstructurally-Small Fatigue-Crack Propagation in Al-Cu Alloysen_US
dc.typevideo/moving imageen_US
dc.description.viewer1_hcdg1mp8en_US


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