Journal
SCRIPTA MATERIALIA
Volume 171, Issue -, Pages 87-91Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.05.018
Keywords
Internal fatigue cracks; Three-dimensional tomography; Synchrotron radiation; Titanium alloys; Spark plasma sintering
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Funding
- French National Research Agency (GIGADEF ANR project) [ANR-16-CE08-0039]
- Agence Nationale de la Recherche (ANR) [ANR-16-CE08-0039] Funding Source: Agence Nationale de la Recherche (ANR)
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Fatigue specimens designed with controlled internal defects were obtained by diffusion bonding of Ti-6Al-4V sheets containing femtosecond laser drilled notches. Crack initiation from the internal defect occurred systematically. The cracks were characterised by in situ synchrotron X-ray tomography. Propagation rates are lower than those of surface cracks of comparable sizes in the same material and fall between experimental data obtained for fatigue cracks propagating in air and in vacuum. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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