Ageing characteristics of the metastable gamma phase in U–9 wt.% Mo alloy: experimental observations and thermodynamic validation

Neogy, S.; Saify, M.T.; Jha, Santosh Kumar; Srivastava, D.; Dey, G.K.

doi:10.1080/14786435.2015.1081300

Cited by 13 publications

(4 citation statements)

References 46 publications

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“…Despite the large number of experimental and theoretical studies on the phase diagram, structure, and kinetics of phase transitions in the uranium-molybdenum system performed in the 1950s to 1970s, there is a lot of interest in studying the properties of metal fuels and optimizing the design of fuel structures (for example, dispersed fuel). Although Mo stabilizes the γ-phase of U-Mo alloys, it is still metastable and may decompose into a lamellar two-phase mixture of the orthorhombic α-U and the tetragonal γ -phase U 2 Mo [6][7][8][9]. The microstructure of U-Mo alloy is an inhomogeneous dendrite structure with Mo-rich and Mo-lean regions [6,7,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Although Mo stabilizes the γ-phase of U-Mo alloys, it is still metastable and may decompose into a lamellar two-phase mixture of the orthorhombic α-U and the tetragonal γ -phase U 2 Mo [6][7][8][9]. The microstructure of U-Mo alloy is an inhomogeneous dendrite structure with Mo-rich and Mo-lean regions [6,7,[10][11][12][13]. Mo segregation may affect γ-phase stability [6,9].…”

Section: Introductionmentioning

confidence: 99%

“…The microstructure of U-Mo alloy is an inhomogeneous dendrite structure with Mo-rich and Mo-lean regions [6,7,[10][11][12][13]. Mo segregation may affect γ-phase stability [6,9]. Thus, discussions about the possibilities of stabilizing the homogeneous cubic γ-phase of U-Mo alloys at low temperatures (near room temperature) and under reactor irradiation conditions still continue.…”

Section: Introductionmentioning

confidence: 99%

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Structure and Phase Transition Features of Monoclinic and Tetragonal Phases in U–Mo Alloys

Kolotova

Gordeev

2020

Crystals

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Using molecular dynamics simulations, we studied the structural properties of orthorhombic, monoclinic, and body-centered tetragonal (bct) phases of U–Mo alloys. A sequence of shear transformations between metastable phases takes place upon doping of uranium with molybdenum from pure α -U: orthorhombic α ′ → monoclinic α ″ → bct γ 0 → body-centered cubic (bcc) with doubled lattice constant γ s → bcc γ . The effects of alloy content on the structure of these phases have been investigated. It has been shown that increase in molybdenum concentration leads to an increase in the monoclinic angle and is more similar to the γ 0 -phase. In turn, tetragonal distortion of the γ 0 -phase lattice with displacement of a central atom in the basic cell along the <001> direction makes it more like the α ″ -phase. Both of these effects reduce the necessary shift in atomic positions for the α ″ → γ 0 -phase transition.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure and Phase Transition Features of Monoclinic and Tetragonal Phases in U–Mo Alloys

Kolotova

Gordeev

2020

Crystals

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“…Alloys possessing the metastable -U phase during both fabrication and irradiation have demonstrated adequate performance as a nuclear fuel material (e.g., swelling, coefficient of thermal expansion, corrosion, mechanical properties). During fuel fabrication and reactor operation, there is a propensity for metastable  phase to transition to thermodynamically stable, but mechanically disadvantageous, and  " (U 2 Mo) phases [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Development of multilayer perceptron networks for isothermal time temperature transformation prediction of U-Mo-X alloys

Johns

Burkes

2017

Journal of Nuclear Materials

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In this work, a multilayered perceptron (MLP) network is used to develop predictive isothermal timetemperature-transformation (TTT) models covering a range of U-Mo binary and ternary alloys. The selected ternary alloys for model development are U-Mo-Ru, U-Mo-Nb, U-Mo-Zr, U-Mo-Cr, and U-MoRe. These model"s ability to predict 'novel' U-Mo alloys is shown quite well despite the discrepancies between literature sources for similar alloys which likely arise from different thermalmechanical processing conditions. These models are developed with the primary purpose of informing experimental decisions. Additional experimental insight is necessary in order to reduce the number of experiments required to isolate ideal alloys. These models allow test planners to evaluate areas of experimental interest; once initial tests are conducted, the model can be updated and further improve follow-on testing decisions. The model also improves analysis capabilities by reducing the number of data points necessary from any particular test. For example, if one or two isotherms are measured during a test, the model can construct the rest of the TTT curve over a wide range of temperature and time. This modeling capability reduces the cost of experiments while also improving the value of the results from the tests. The reduced costs could result in improved material characterization and therefore improved fundamental understanding of TTT dynamics. As additional understanding of phenomena driving TTTs is acquired, this type of MLP model can be used to populate unknowns (such as material impurity and other thermal mechanical properties) from past literature sources.

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Microstructural Evolution of the Interdiffusion Zone between U-9 Wt Pct Mo Fuel Alloy and Zr-1 Wt Pct Nb Cladding Alloy Upon Annealing

Neogy

Laik

Saify

et al. 2017

Metall Mater Trans A

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Ageing characteristics of the metastable gamma phase in U–9 wt.% Mo alloy: experimental observations and thermodynamic validation

Cited by 13 publications

References 46 publications

Structure and Phase Transition Features of Monoclinic and Tetragonal Phases in U–Mo Alloys

Structure and Phase Transition Features of Monoclinic and Tetragonal Phases in U–Mo Alloys

Development of multilayer perceptron networks for isothermal time temperature transformation prediction of U-Mo-X alloys

Microstructural Evolution of the Interdiffusion Zone between U-9 Wt Pct Mo Fuel Alloy and Zr-1 Wt Pct Nb Cladding Alloy Upon Annealing

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