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

Lear, Calvin Robert; Gigax, Jonathan Gregory; El Atwani, Osman; Chancey, Matthew Ryan; Kim, Hyosim; Li, Nan; Wang, Yongqiang; Fensin, Saryu Jindal

doi:10.1016/j.scriptamat.2022.114531

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

Journal Article · 23 January 2022 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2022.114531 · OSTI ID:2222613

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2222613

Report Number(s):: LA-UR--21-29419

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Vol. 212; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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