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

C. R. Lear; J. G. Gigax; O. El Atwani; M. R. Chancey; H. Kim; N. Li; Y. Wang; S. J. Fensin

doi:10.1016/j.scriptamat.2022.114531

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

C. R. Lear
, J. G. Gigax
, O. El Atwani
, M. R. Chancey
, H. Kim
, N. Li
, Y. Wang
, S. J. Fensin

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

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.

Original language	English
Article number	114531
Journal	Scripta Materialia
Volume	212
DOIs	https://doi.org/10.1016/j.scriptamat.2022.114531
State	Published - Apr 15 2022
Externally published	Yes

Funding

This work was supported by the U.S. Department of Energy through the Los Alamos National Laboratory. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy (Contract No. 89233218CNA000001).

Keywords

Helium
Nanomechanical Testing
Strength

Access to Document

10.1016/j.scriptamat.2022.114531

Cite this

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title = "Effects of helium cavity size and morphology on the strength of pure titanium",

abstract = "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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T1 - Effects of helium cavity size and morphology on the strength of pure titanium

AU - Lear, C. R.

AU - Gigax, J. G.

AU - El Atwani, O.

AU - Chancey, M. R.

AU - Kim, H.

AU - Li, N.

AU - Wang, Y.

AU - Fensin, S. J.

PY - 2022/4/15

Y1 - 2022/4/15

N2 - 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.

AB - 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.

KW - Helium

KW - Nanomechanical Testing

KW - Strength

UR - https://www.scopus.com/pages/publications/85123195005

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DO - 10.1016/j.scriptamat.2022.114531

M3 - Article

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VL - 212

JO - Scripta Materialia

JF - Scripta Materialia

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ER -

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

Abstract

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Keywords

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