|About this Abstract
||Materials Science & Technology 2012
||Phase Stability, Diffusion, Kinetics and their Applications (PSDK-VII)
||Interdiffusion Behavior of the Al-Zr System and the Effects of Si
||Judith Dickson, Ashley Ewh, Dennis D. Keiser, Jr., Yongho Sohn
|On-Site Speaker (Planned)
Zirconium has recently garnered attention for use as a diffusion barrier between U-Mo fuels and Al matrix alloys. For this application, the Al-Zr as well as Al-Si-Zr systems were systematically examined in order to obtain better insight into the thermodynamic and kinetic behavior. Solid to solid diffusion couples were assembled using disks of pure Zr (99.2 %) and pure Al (99.999 %) as well as Al-2Si, Al-5Si and AA6061 alloys. These were then annealed at 425, 475, and 560°C for 30, 15, and 10 days, respectively. Scanning electron microscopy was used to inspect the interdiffusion zone, while phase identification was performed using energy dispersive spectroscopy. From the preceding data, the growth rates as well as interdiffusion coefficients of the intermetallic phases were extracted. These results are discussed with respect to the growth kinetics, thermodynamics and previous studies. The effect of Si on the growth kinetics is also discussed.