Abstract
In the interfacial reaction zone between AlN and a Ag Cu–Ti braze alloy, a previously unreported phase belonging to the η family (M6X) has been found by transmission electron microscopy. The compound has an approximate stoichiometry of (Ti3−x Cu3−xAl2x)N and space group symmetry of Fd3m, with a cubic lattice parameter of a0 = 1.13 ± 0.02 nm. Large (>1 μm diameter), defect-free grains are present with occasional {111} twinning. Grain boundaries are free of second phases and amorphous interlayers. The formation of continuous layers that grow with reaction time indicate possible stability of the η nitride at 900 °C. The presence of this phase is integral to the chemical and structural development of the ceramic-metal interface.
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