Helium causing disappearance of a/2<111> dislocation loops in binary Fe-Cr ferritic alloys

Bhattacharya, Arunodaya; Henry, Jean; Decamps, Brigitte; Zinkle, Steven J.; Meslin, Estelle

doi:10.1016/j.jnucmat.2021.153213

Title: Helium causing disappearance of a/2<111> dislocation loops in binary Fe-Cr ferritic alloys

Journal Article · Mon Jul 26 00:00:00 EDT 2021 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2021.153213· OSTI ID:1813250

^[1]; Henry, Jean ^[2]; Decamps, Brigitte ^[3]; Zinkle, Steven J. ^[4]; Meslin, Estelle ^[5]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA-Saclay), Gif-sur-Yvette (France)
Univ. Paris-Saclay, Gif-sur-Yvette (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA-Saclay), Gif-sur-Yvette (France); Univ. Paris-Saclay, Gif-sur-Yvette (France)

In this work, single and dual-beam self-ion irradiations were performed at 500°C on ultra-high purity Fe14%Cr alloy to ~0.33 displacements-per-atom (dpa), and 0 or 3030 atomic-parts-per-million (appm) helium/dpa, respectively. Using transmission electron microscopy, we reveal that helium can drastically modify the dislocation loop Burgers vector in Fe-Cr alloys. Helium co-implantation caused complete disappearance of a/2<111> type dislocation loops, and the microstructure consisted of only a<100> loops. Conversely, a/2<111> type loops were predominant without He co-implantation. The total loop density remained largely unaffected. The results strikingly contrast literature asserting that helium stabilizes a/2<111> type loops in bcc Fe alloys, based on low temperature irradiations. Collectively analyzing the results with literature suggest that the small positive interaction between helium and self-interstitial atoms (SIA) in Fe predicted by atomistic simulations maybe insufficient to holistically explain the dislocation loop microstructure development in presence of helium. Helium-SIA positive binding inadvertently implies elevated a/2<111> loop fraction and higher loop densities that the present results contradict. Helium induced high cavity density causing a preferential loss of highly glissile <111> clusters, leaving the matrix saturated with <100> type clusters is proposed as a potential mechanism. Further, the in-situ irradiations combined with Burgers vector analysis strengthened the evidence of Cr-induced dislocation loop mobility reduction that appears to stabilize the a/2<111> type loops and causes higher loop densities in Fe-Cr alloys.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); European Research Council (ERC)

Grant/Contract Number:: AC05-00OR22725; 633053

OSTI ID:: 1813250

Journal Information:: Journal of Nuclear Materials, Vol. 556; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Fe-Cr alloys
Ion irradiation
Transmission electron microscopy (TEM)
Helium
Chromium

Title: Helium causing disappearance of a/2<111> dislocation loops in binary Fe-Cr ferritic alloys

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