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Crystals 2019, 9(3), 147; https://doi.org/10.3390/cryst9030147

Radiation Tolerance in Nano-Structured Crystalline Fe(Cr)/Amorphous SiOC Composite

1
Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68583-0857, USA
2
Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843-3128, USA
3
Nebraska Center for Energy Sciences Research, University of Nebraska-Lincoln, Lincoln, NE 68583-0857, USA
4
Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588-0298, USA
*
Author to whom correspondence should be addressed.
Received: 7 February 2019 / Revised: 5 March 2019 / Accepted: 9 March 2019 / Published: 13 March 2019
(This article belongs to the Special Issue Nanostructured Ferritic Alloys)
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Abstract

The management of irradiation defects is one of key challenges for structural materials in current and future reactor systems. To develop radiation tolerant alloys for service in extreme irradiation environments, the Fe self-ion radiation response of nanocomposites composed of amorphous silicon oxycarbide (SiOC) and crystalline Fe(Cr) were examined at 10, 20, and 50 displacements per atom damage levels. Grain growth in width direction was observed to increase with increasing irradiation dose in both Fe(Cr) films and Fe(Cr) layers in the nanocomposite after irradiation at room temperature. However, compared to the Fe(Cr) film, the Fe(Cr) layers in the nanocomposite exhibited ~50% less grain growth at the same damage levels, suggesting that interfaces in the nanocomposite were defect sinks. Moreover, the addition of Cr to α-Fe was shown to suppress its grain growth under irradiation for both the composite and non-composite case, consistent with earlier molecular dynamic (MD) modeling studies. View Full-Text
Keywords: radiation tolerant materials; amorphous silicon oxycarbide; nanocrystalline Fe; composite; interface radiation tolerant materials; amorphous silicon oxycarbide; nanocrystalline Fe; composite; interface
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Su, Q.; Wang, T.; Shao, L.; Nastasi, M. Radiation Tolerance in Nano-Structured Crystalline Fe(Cr)/Amorphous SiOC Composite. Crystals 2019, 9, 147.

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