Helium bubble formation in ultrafine and nanocrystalline tungsten under different extreme conditions

El-atwani, O.; Hattar, Khalid Mikhiel; Hinks, J. A.; Greaves, G.; Harilal, S. S.; Hassanein, A.

doi:10.1016/j.jnucmat.2014.12.095

Title: Helium bubble formation in ultrafine and nanocrystalline tungsten under different extreme conditions

Journal Article · Thu Dec 25 00:00:00 EST 2014 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2014.12.095· OSTI ID:1183004

El-atwani, O. ^[1]; Hattar, Khalid Mikhiel ^[2]; Hinks, J. A. ^[3]; Greaves, G. ^[3]; Harilal, S. S. ^[4]; Hassanein, A. ^[5]

Purdue Univ., Birck Nanotechnology Center, and Center for Material Under Extreme Environment, West Lafayette, IN (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Univ. of Huddersfield (United Kingdom)
Purdue Univ., West Lafayette, IN (United States); Center for Materials Uncer Extreme Environment, West Lafayette, IN (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Purdue Univ., West Lafayette, IN (United States); Center for Materials Uncer Extreme Environment, West Lafayette, IN (United States)

We investigated the effects of helium ion irradiation energy and sample temperature on the performance of grain boundaries as helium sinks in ultrafine grained and nanocrystalline tungsten. Irradiations were performed at displacement and non-displacement energies and at temperatures above and below that required for vacancy migration. Microstructural investigations were performed using Transmission Electron Microscopy (TEM) combined with either in-situ or ex-situ ion irradiation. Under helium irradiation at an energy which does not cause atomic displacements in tungsten (70 eV), regardless of temperature and thus vacancy migration conditions, bubbles were uniformly distributed with no preferential bubble formation on grain boundaries. Moreover, at energies that can cause displacements, bubbles were observed to be preferentially formed on the grain boundaries only at high temperatures where vacancy migration occurs. Under these conditions, the decoration of grain boundaries with large facetted bubbles occurred on nanocrystalline grains with dimensions less than 60 nm. Finally, we discuss the importance of vacancy supply and the formation and migration of radiation-induced defects on the performance of grain boundaries as helium sinks and the resulting irradiation tolerance of ultrafine grained and nanocrystalline tungsten to bubble formation.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1183004

Alternate ID(s):: OSTI ID: 1252348

Report Number(s):: SAND2014-15238J; 534153

Journal Information:: Journal of Nuclear Materials, Vol. 458; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 106 works

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