Effects of helium cavity size and morphology on the strength of pure titanium

In this study, high-purity α-titanium was implanted with helium to observe cavity morphology – size, number density, and form (i.e., bubbles vs. voids) – effects on materials strength. Increasing implantation temperatures lead to an Arrhenius-type (i.e., exponential) increase in cavity size, a trans...

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Bibliographic Details
Published in:Scripta materialia 2022-01, Vol.212
Main Authors: Lear, Calvin Robert, Gigax, Jonathan Gregory, El Atwani, Osman, Chancey, Matthew Ryan, Kim, Hyosim, Li, Nan, Wang, Yongqiang, Fensin, Saryu Jindal
Format: Article
Language:English
Subjects:
Helium
MATERIALS SCIENCE
Nanomechanical testing
Strength
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Summary:In this study, high-purity α-titanium was implanted with helium to observe cavity morphology – size, number density, and form (i.e., bubbles vs. voids) – effects on materials strength. Increasing implantation temperatures lead to an Arrhenius-type (i.e., exponential) increase in cavity size, a transition from spherical bubbles to faceted voids, and a marked increase in strength (~20–50%). Implanted samples deformed uniformly in contrast to nano-compression of unimplanted or alloyed titanium, but pillars with the largest faceted voids developed a type of bulging localized deformation. Affected voids were repeatedly sheared, becoming rough and shrunken. Dislocation-cavity interactions and the role of helium content within cavities are considered.
ISSN:1359-6462
1872-8456