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arXiv · 1803.04007

Characterizing solute hydrogen and hydrides in pure and alloyed titanium at the atomic scale

Yanhong Chang·Andrew J. Breen·Zahra Tarzimoghadam·Philipp Kürnsteiner·Hazel Gardner·Abigail Ackerman·Anna Radecka·Paul A. J. Bagot·Wenjun Lu·Tong Li·Eric A. Jägle·Michael Herbig·Leigh T. Stephenson·Michael P. Moody·David Rugg·David Dye·Dirk Ponge·Dierk Raabe·Baptiste Gault
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Abstract

Ti has a high affinity for hydrogen and is a typical hydride formers. Ti-hydride are brittle phases which probably cause premature failure of Ti-alloys. Here, we used atom probe tomography and electron microscopy to investigate the hydrogen distribution in a set of specimens of commercially pure Ti, model and commercial Ti-alloys. Although likely partly introduced during specimen preparation with the focused-ion beam, we show formation of Ti-hydrides along {\alpha} grain boundaries and {\alpha}/\b{eta} phase boundaries in commercial pure Ti and {\alpha}+\b{eta} binary model alloys. No hydrides are observed in the {\alpha} phase in alloys with Al addition or quenched-in Mo supersaturation.

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Yanhong Chang, Andrew J. Breen, Zahra Tarzimoghadam, Philipp Kürnsteiner, Hazel Gardner, Abigail Ackerman, Anna Radecka, Paul A. J. Bagot, Wenjun Lu, Tong Li, Eric A. Jägle, Michael Herbig, Leigh T. Stephenson, Michael P. Moody, David Rugg, David Dye, Dirk Ponge, Dierk Raabe, Baptiste Gault. 2018-03-11. Characterizing solute hydrogen and hydrides in pure and alloyed titanium at the atomic scale. https://doi.org/10.1016/j.actamat.2018.02.064

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