Selected Observations in Phase Constituents, Growth Kinetics and Microstructural Development of Aluminides in U-Mo vs. Al and 6061 Diffusion Couples Annealed at 600°C |
| Journal |
Defect and Diffusion Forum (Volumes 289 - 292) |
| Volume |
Diffusion in Materials - DIMAT2008 |
| Edited by |
A. Agüero, J.M. Albella, M.P. Hierro, J. Phillibert and F.J. Pérez Trujillo |
| Pages |
41-49 |
| DOI |
10.4028/www.scientific.net/DDF.289-292.41 |
| Online since |
April, 2009 |
| Authors |
E. Perez,
Dennis D. Keiser,
Yong Ho Sohn
|
| Keywords |
Growth Kinetic, Metallic Nuclear Fuels, U-Mo Alloy, U-Mo-Al, Uranium Alloys |
| Abstract |
This paper presents selected experimental observations of phase constituents, growth kinetics, and microstructural development of aluminide phases that develop in solid-to-solid diffusion couples assembled with U-7wt.%Mo, U-10wt.%Mo and U-12wt.%Mo vs. Al and 6061 alloy after a diffusion anneal at 600°C for 24 hours. Scanning electron microscopy coupled with energy dispersive spectroscopy, electron microprobe analysis, and transmission electron microscopy via focused ion beam in-situ lift-out were employed to characterize the interaction layer that develops by interdiffusion. While concentration profiles exhibited no significant gradients, microstructural analysis revealed the presence of extremely complex and nano-scale phase constituents with presence of orthorhombic--U, cubic-UAl3, orthorhombic-UAl4, hexagonal-U6Mo4Al43 and diamond cubic-UMo2Al20 phases. Presence of multi-phase layers with microstructure, which suggest a significant role of grain boundary diffusion, was observed. |
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