Abstract
The microstructures of bulk Zr 2Al 3C 4 and Zr 3Al 3C 5 ceramics have been investigated using transmission electron microscopy and scanning transmission electron microscopy. These two carbides were determined to have a point group 6/ mmm and a space group P6 3/ mmc using selected-area electron diffraction and convergent beam electron diffraction. The atomic-scale microstructures of Zr 2Al 3C 4 and Zr 3Al 3C 5 were investigated through high-resolution imaging and Z-contrast imaging. Furthermore, intergrowth between Zr 2Al 3C 4 and Zr 3Al 3C 5 was identified. Stacking faults in Zr 3Al 3C 5 were found to result from the insertion of an additional Zr–C layer. Cubic ZrC was occasionally identified to be incorporated in elongated Zr 3Al 3C 5 grains. In addition, Al may induce a twinned ZrC structure and lead to the formation of ternary zirconium aluminum carbides.
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