Effect of Si and Zr on the interdiffusion of U–Mo alloy and Al

Park, Jong Man; Ryu, Ho Jin; Oh, Seok Jin; Lee, Don Bae; Kim, Chang Kyu; Kim, Yeon Soo; Hofman, G.L.

doi:10.1016/j.jnucmat.2007.09.059

Cited by 62 publications

(41 citation statements)

References 10 publications

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“…Cornen et al 7 has also reported a Si-depleted region in the Al alloy near the IL and a Si-rich region near the fuel side or near the Al side of the IL, depending on the Si content in the Al matrix. This differs slightly with observations made by Park et al 26 where he mentions that the IL Si content varies significantly but has found high-Si content regions near the Al side of the IL. Also, he comments that in some couples, the Si content drops near both the U and Al interface with the IL, but the Al + Si content remains constant at approximately 80% as determined by EPMA.…”

Section: The Precipitate-free Zone (Pfz)contrasting

confidence: 97%

“…In annealing dispersion fuels, and based on energy dispersive spectroscopy (EDS) and electron probe micro-analysis (EPMA) evidence, Ryu et al 31 observed that a fuel plate annealed at 580°C for 10 hours did not have any evidence of Si accumulation in the IL; however, when annealed at 550°C for 25 hours, a 20 at.% Si was present in the IL. In diffusion couples, Mirandou et al, 19 Cornen et al, 7 and Park et al 26 report the accumulation of Si in the IL. In FSW diffusion couples, Keiser et al 11 mentions that the Al and Si content vary significantly within the IL, but the sum of the two remains constant around 70 at.% based on EDS/transmission electron microscopy (TEM) results.…”

Section: Mo and Si Contentmentioning

confidence: 97%

“…Based on the literature, Mo does not have as strong of an influence as Si does. Park et al 26 conducted a study in diffusion couples using binary Al-Si alloys with 2 and 5 wt% Si to compare results with those using pure Al. These results reveal a clear decrease in IL thickness with the addition of Si; however, they also indicate that a Si threshold exists, after which it is no longer beneficial to add more Si to the system.…”

Section: Mo and Si Contentmentioning

confidence: 99%

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Interaction Layer Characteristics in U-xMo Dispersion/Monolithic Fuels

Porter¹

2010

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SUMMARYPublished data concerning the interaction layer (IL) formed between U-xMo fuel alloy and aluminum (Al)-based matrix or cladding materials was reviewed, including the effects of silicon (Si) content in the matrix/cladding, molybdenum (Mo) content in the fuel, pre-irradiation thermal treatments, irradiation, and test temperature. The review revealed that tests conducted in the laboratory produce results different from those conducted in an irradiation environment. However, the laboratory testing relates well to thermal treatments performed prior to irradiation and helps in understanding the effects that these pre-irradiation treatments have on in-reactor performance. A small, Si-enriched IL, formed during a step in the fabrication process, seems to be stable during irradiation, helping to prevent the rapid growth of an irradiation-induced IL. Moreover, the Si-enriched IL seems to be important in delaying the onset of rapid growth of fission gas bubbles.Conclusions from irradiated fuels data have been repeated many times in the literature review. However, as related to the "Desired Characteristics of the IL" mentioned near the beginning of this report, several more conclusions can be drawn:1. An IL with phases akin to UAl 3 is desired for optimum fuel performance, but at low temperatures, and especially in an irradiation atmosphere, the desired (Al+Si)/(U+Mo) ratio of three is difficult to produce. When the fuel operating temperature is low, it is important to create a pre-irradiation IL enriched in Si. This pre-formed IL is relatively stable, performs well in terms of swelling resistance, and prevents rapid IL growth during irradiation. Fabrication-related heat treatments should be limited in order to maintain a thin, Si-enriched layer containing potentially beneficial phases.2. At higher operating temperatures (>150-170°C), IL formation in reactor may not be so dependent on pre-irradiation IL formation, especially at high burnup; a pre-fabricated IL seems to be less stable at high burnup and high operating temperature. Moreover, the (Al+SI)/(U+Mo) ratio of three occurs more often at higher temperature. For these two reasons, it is important at high operating temperature to also have a matrix with significant Si content to create an IL in-reactor with the right characteristics.3. Out-of-reactor testing seems to indicate that Si in the matrix material is required in some concentration (2%, 5%, ?) to provide for a thin, Si-enriched IL formed before irradiation of a fuel plate. It ensures that the IL contains beneficial phases or prevents formation of some known to promote poor fuel performance. Significant progress has been made in determining the desired characteristics of the IL.4. The use of a fuel with stable gamma phase appears to allow more predictable performance regarding both a beneficial pre-irradiation layer and the fuel performance (low swelling) to high burnup. Destabilization of the gamma phase may create problems with IL breakaway growth.5. A theory whereby prevention of the U 6 Mo 4 Al 43 comp...

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Section: The Precipitate-free Zone (Pfz)contrasting

confidence: 97%

Section: Mo and Si Contentmentioning

confidence: 97%

Section: Mo and Si Contentmentioning

confidence: 99%

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Interaction Layer Characteristics in U-xMo Dispersion/Monolithic Fuels

Porter¹

2010

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“…The IL growth rate was also reduced in Si-added tests compared to pure Al tests. A more systematic tests exploring the effects of adding Zr and Ti in U-Mo and adding Si in Al were conducted at KAERI [57,58]. Major findings from these studies include: 1) Zr and Ti are effective suppressing IL growth, 2) Ti is less harmful than Zr in terms of deteriorating γ-stability of U-Mo during annealing tests, 3) Ti is more effective in reducing IL growth than Zr at the addition of the same atomic %, 4) The (Al+Si)/(U+Mo+Ti) ratios were less than 4 in the ILs, 5) Ti and Zr addition has a synergistic effect when Si is concomitantly added in the Al.…”

Section: Interaction Between U-mo and Al-simentioning

confidence: 99%

“…This prediction is applicable for RERTR-9B test. ………………………………… CNEA diffusion couple test result with U-Mo/Al-Si showing Si-precipitate depletion zone [57]. …………………………………………………………… 33…”

mentioning

confidence: 99%

Improved performance of U-Mo dispersion fuel by Si addition in Al matrix.

Kim¹,

Hofman²

2011

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Dispersion Fuels

Hofman

Kim

2015

Materials Science and Technology

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The article contains sections titled: Introduction Constituent Phases of Fuel Compounds U–Al Alloy and UAl x Uranium Oxides Uranium Silicides U–Mo Alloy Fabrication Production of Fuel Powders Fabrication of Fuel Plates, Rods, and Tubes Physical Properties Fuel Meat Void Fraction Fuel Meat Density and Constituent Volume Fractions Thermal Properties Heat Capacity Thermal Conductivity U–Al Alloy Powder Metallurgy Fuels Coefficient of Thermal Expansion Mechanical Properties of As‐Fabricated Materials Chemical Properties Fuel– Al Reactions Reactions at Temperatures below Aluminum Melting High‐Temperature Exothermic Reactions Fuel–Water and Fuel–Steam Reactions Irradiation Behavior Mechanical Property Changes Fuel– Al Reaction under Irradiation Interaction Layer Growth in Silicide/ Al Dispersion Interaction Layer Growth in U–Mo/Al Dispersion Fuel Swelling Ceramic Fuels Intermetallic Compound Fuel Summary of Fuel Swelling Blister Threshold Temperature Fission Product Release Fuel Deformation by Creep in U–Mo/Al Dispersion Al Alloy Cladding Coolant‐Side Corrosion Fuel Failure Behavior

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Effect of Si and Zr on the interdiffusion of U–Mo alloy and Al

Cited by 62 publications

References 10 publications

Interaction Layer Characteristics in U-xMo Dispersion/Monolithic Fuels

Interaction Layer Characteristics in U-xMo Dispersion/Monolithic Fuels

Improved performance of U-Mo dispersion fuel by Si addition in Al matrix.

Dispersion Fuels

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