Phase relations in the U–Mo–Al ternary system

Noël, H.; Tougait, Olivier; Dubois, S.

doi:10.1016/j.jnucmat.2009.01.013

Cited by 16 publications

(16 citation statements)

References 16 publications

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“…Besides, as indicated by Noël et al [25], the substitution of Al by Mo atoms in the cubic (MgCu 2 type) binary UAl 2 phase leads to a remarkable solid solution UAl 2Àx Mo x up to x = 0.5, rather than the substitution of Mo atoms to U sites, leading to (U,Mo)Al x proposed by Keiser et al [27].…”

Section: The U-mo-al Ternary Systemmentioning

confidence: 88%

“…Certainly, there are some differences between the calculated isothermal sections and the experimental ones [25], e.g. the terminal U-rich BCC_A2 single phase region disappears from the calculated isothermal section at 673 K while was reported to be stable in the experimental one [25].…”

Section: The U-mo-al Ternary Systemmentioning

confidence: 90%

“…[25], the UAl 2 phases exhibit ternary solubility of Mo in the U-Mo-Al ternary system. In light of the experimental homogeneity range [25], UAl 2 is modeled as U 0.333: (Al,Mo) 0.667 , of which the Gibbs energy is formalized as…”

Section: Binary Intermetallic Compoundsmentioning

confidence: 90%

“…Noël et al [25] experimentally studied the isothermal sections at 673 K and 1073 K [25]. According to Noël et al [25], three ternary compounds were discovered: UMo 2Àx Al 20+x (À0.3 < x < 0.75 at 1073 K) with the cubic structure CeCr 2 Al 20 (space group Fd3 m), U 6 Mo 4+x Al 43Àx (0 < x < 3 at 1073 K) with the hexagonal Ho 6 Mo 4 Al 43 structure (space group P6 3 /mcm), and UAl 2Àx Mo x (0.6 < x < 0.7 at 1073 K, 0.7 < x < 0.85 at 673 K), a laves phase of hexagonal MgZn 2 type. The hexagonal-U 6 Mo 4 Al 43 and diamond cubic-UMo 2 Al 20, were later confirmed to exist in the alloys with composition 85.7Al-11.44U-2.86Mo and 87.5Al-10U-2.5Mo in at.% homogenized at 773 K for 200 h by adopting X-ray diffraction, SEM and TEM/STEM method [26].…”

Section: The U-mo-al Ternary Systemmentioning

confidence: 99%

“…In this ternary system, the crystal structure refinements and site occupation of atoms of the ternary phases UMo 2Àx Al 20+x and U 6 Mo 4+x Al 43Àx have been experimentally investigated by Noël et al [25]. According to Noël et al [25], the two phases are described with different models.…”

Section: Ternary Intermetallic Compoundsmentioning

confidence: 99%

See 4 more Smart Citations

Thermodynamic assessment of the U–Mo–Al system

Zhang¹,

Cui²,

Xu³

et al. 2010

Journal of Nuclear Materials

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Section: The U-mo-al Ternary Systemmentioning

confidence: 88%

Section: The U-mo-al Ternary Systemmentioning

confidence: 90%

Section: Binary Intermetallic Compoundsmentioning

confidence: 90%

Section: The U-mo-al Ternary Systemmentioning

confidence: 99%

Section: Ternary Intermetallic Compoundsmentioning

confidence: 99%

See 3 more Smart Citations

Thermodynamic assessment of the U–Mo–Al system

Zhang¹,

Cui²,

Xu³

et al. 2010

Journal of Nuclear Materials

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Phase Constituents and Microstructure of Interaction Layer Formed in U-Mo Alloys vs Al Diffusion Couples Annealed at 873 K (600 °C)

Perez

Keiser

Sohn

2011

Metall Mater Trans A

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U-Mo dispersion and monolithic fuels are being developed to fulfill the requirements for research reactors, under the Reduced Enrichment for Research and Test Reactors program. In dispersion fuels, particles of U-Mo alloys are embedded in the Al-alloy matrix, while in monolithic fuels, U-Mo monoliths are roll bonded to the Al-alloy matrix. In this study, interdiffusion and microstructural development in the solid-to-solid diffusion couples, namely, U-15.7 at. pct Mo (7 wt pct Mo) vs pure Al, U-21.6 at. pct Mo (10 wt pct Mo) vs pure Al, and U-25.3 at. pct Mo (12 wt pct Mo) vs pure Al, annealed at 873 K (600°C) for 24 hours, were examined in detail. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron probe microanalysis (EPMA) were employed to examine the development of a very fine multiphase interaction layer with an approximately constant average composition of 80 at. pct Al. Extensive TEM was carried out to identify the constituent phases across the interaction layer based on selected area electron diffraction and convergent beam electron diffraction (CBED). The cubic-UAl 3 , orthorhombic-UAl 4 , hexagonal-U 6 Mo 4 Al 43 , and cubicUMo 2 Al 20 phases were identified within the interaction layer that included two-and three-phase layers. Residual stress from large differences in molar volume, evidenced by vertical cracks within the interaction layer, high Al mobility, Mo supersaturation, and partitioning toward equilibrium in the interdiffusion zone were employed to describe the complex microstructure and phase constituents observed. A mechanism by compositional modification of the Al alloy is explored to mitigate the development of the U 6 Mo 4 Al 43 phase, which exhibits poor irradiation behavior that includes void formation and swelling.

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