Microstructural Characterization of Ion Irradiated ODS MA956 Alloy

Journal Article · Sat Jul 22 00:00:00 EDT 2023 · Microscopy and Microanalysis

DOI:https://doi.org/10.1093/micmic/ozad067.804· OSTI ID:2222396

Lu, Yu ^[1]; Wu, Yaqiao ^[1]; Prabhakaran, Ramprashad ^[2]; Dubey, Megha ^[1]; Shao, Lin ^[3]

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1. Boise State University, ID (United States); Center for Advanced Energy Studies, Idaho Falls, ID (United States)
2. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
3. Texas A & M University, College Station, TX (United States)

Oxide Dispersion Strengthened (ODS) alloys are considered as promising nuclear materials for the next generation advanced nuclear reactors due to their improved elevated temperature mechanical properties and radiation damage resistance. MA956 is a commercial ODS alloy with superior oxidation resistance and creep strength at elevated temperatures. The improved properties for ODS alloys can be attributed to the presence of dispersed nanosized oxide particles. These oxide particles can act as barriers to dislocation motion and provide additional sinks and sites for point defect recombination. Hence, their stability can greatly affect the properties of the irradiated ODS alloys. Besides, irradiation will induce defects into the ODS alloys, and these defects can develop further as irradiation dose increases. Furthermore, the defects propagation can significantly undermine the mechanical properties of the bulk materials, resulting in irradiation hardening and lower ductility. Therefore, it is necessary to have a good understanding of the defect’s evolution with irradiation. Hence, efforts are ongoing to understand the effect of ion irradiation on ODS MA956 with emphasis on oxide particles and evolution of defects as a function of dose (2.5, 50 and 100 dpa).

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• Grant/Contract Number: AC05-76RL01830
• OSTI ID: 2222396
• Report Number(s): PNNL-SA--182254
• Journal Information: Microscopy and Microanalysis, Journal Name: Microscopy and Microanalysis Journal Issue: Supplement_1 Vol. 29; ISSN 1431-9276
• Publisher: Microscopy Society of America (MSA)
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
36 MATERIALS SCIENCE
Irradiation effects
MA956
ODS ferritic alloy
TEM analysis
APT