Growth Kinetics of Intermetallic Phases in U-Mo vs. Al Alloy Diffusion Couples Annealed at 550°C

E. Perez; N. Hotaling; Ashley Ewh; Dennis D. Keiser; Yong Ho Sohn

doi:10.4028/www.scientific.net/DDF.266.149

Paper Titles

Diffusion in Metallic Melts
p.101

Diffusion in Bulk Glass Forming Alloys– from the Glass to the Equilibrium Melt
p.109

Non-Random Interaction of Vacancies with Atoms during Interdiffusion and Ionic Conductivity in Materials
p.119

Interdiffusion Behavior in γ-Phase U-Mo Alloy versus Al-6061 Alloy Couples Fabricated by Friction Stir Welding
p.131

Growth Kinetics of Intermetallic Phases in U-Mo vs. Al Alloy Diffusion Couples Annealed at 550°C
p.149

The Influence of Solid State Diffusion on Microstructural Development during Solidification
p.157

Calculation of Gas Carburizing Kinetics from Carbon Concentration Profiles based on Direct Flux Integration
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Assessment of Ternary Multicomponent Diffusion in Alloy 22 (Ni-Cr-Mo)
p.181

Interdiffusion in (fcc) Ni-Cr-X (X = Al, Si, Ge or Pd) Alloys at 700°C
p.191

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Growth Kinetics of Intermetallic Phases in U-Mo vs. Al Alloy Diffusion Couples Annealed at 550°C

Abstract:

This study examined the growth kinetics of intermetallic phases that develop in solid-tosolid diffusion couples assembled with U-7, 10 and 12wt.%Mo vs. Al alloys (Al, Al-2wt.%Si, Al- 5wt.%Si, 4043 and 6061) after a diffusion anneal at 550°C for 24 hours. Based on interdiffusion microstructure and integrated interdiffusion coefficients, the addition of Si into the Al matrix alloy was observed to significantly reduce the growth rate of the intermetallic layer that primarily consisted of (U,Mo)Al4 phase. Growth rate of the (U,Mo)Al4 intermetallic layer also increases slightly with Mo content; however, it was not significant compared to the effect of alloying Si into Al alloys. Growth kinetics of (U,Mo)Al4 intermetallic layer appear highly sensitive to composition of U-Mo fuel alloy and Al cladding alloys, and must be an important criteria in alloy development/selection for optimum fuel performance with due consideration for compositiondependent multicomponent interdiffusion.