Interdiffusion and reaction between Zr and Al alloys from 425 degrees to 625 degrees C
Abbreviated Journal Title
Diffusion; Aluminides, miscellaneous; Silicides, various; Electron; microscopy, transmission; DIFFUSION BARRIER; FUEL; Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy &; Metallurgical Engineering
Zirconium has recently garnered attention for use as a diffusion barrier between U-Mo nuclear fuels and Al cladding alloys. Interdiffusion and reactions between Zr and Al, Al-2 wt.% Si, Al-5 wt.% Si or AA6061 were investigated using solid-to-solid diffusion couples annealed in the temperature range of 425 degrees to 625 degrees C. In the binary Al and Zr system, the Al3Zr and Al2Zr phases were identified, and the activation energy for the growth of the Al3Zr phase was determined to be 347 kJ/mol. Negligible diffusional interactions were observed for diffusion couples between Zr vs. Al-2 wt.% Si, Al-5 wt.% Si and AA6061 annealed at or below 475 degrees C. In diffusion couples with the binary Al-Si alloys at 560 degrees C, a significant variation in the development of the phase constituents was observed including the thick tau(1) (Al5SiZr2) with Si content up to 12 at.%, and thin layers of (Si,Al)(2)Zr, (Al,Si)(3)Zr, Al3SiZr2 and Al2Zr phases. The use of AA6061 as a terminal alloy resulted in the development of both tau(1) (Al5SiZr2) and (Al,Si)(3)Zr phases with a very thin layer of (Al,Si)(2)Zr. At 560 degrees C, with increasing Si content in the Al-Si alloy, an increase in the overall rate of diffusional interaction was observed; however, the diffusional interaction of Zr in contact with multicomponent AA6061 with 0.4-0.8 wt.% Si was most rapid. (C) 2014 Elsevier Ltd. All rights reserved.
"Interdiffusion and reaction between Zr and Al alloys from 425 degrees to 625 degrees C" (2014). Faculty Bibliography 2010s. 5255.