In situ TEM observations of dislocation dynamics in α titanium: Effect of the oxygen content

Abstract : Plastic deformation micro-mechanisms, dislocation structures and glide kinetics in two titanium batches with moderate and high oxygen contents (450 and 3200 wppm, respectively) are investigated by in situ tensile tests in a transmission electron microscope, at room temperature. In both materials, plastic deformation is accommodated with type screw dislocations gliding mainly in prismatic planes. The movement of screw segments is jerky, oxygen-dependent and strongly controlled by pinning on localized obstacles if the oxygen content is high. Dislocation multiplication is mainly controlled by the opening of loops produced by a double-cross slip mechanism at super-jogs. Evidences of composite glide between prismatic, first order pyramidal and basal planes are pointed out, proving the existence of intensive cross slip.
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https://hal.archives-ouvertes.fr/hal-01574268
Contributor : Véronique Doquet <>
Submitted on : Saturday, August 12, 2017 - 6:52:51 PM
Last modification on : Wednesday, March 27, 2019 - 4:16:24 PM

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Bassem Barkia, Jean-Philippe Couzinié, Sylvie Lartigue-Korinek, Ivan Guillot, Véronique Doquet. In situ TEM observations of dislocation dynamics in α titanium: Effect of the oxygen content. Materials Science and Engineering, Elsevier, 2017, 703, pp.331-339. ⟨10.1016/j.msea.2017.07.040⟩. ⟨hal-01574268⟩

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