Abstract
We have studied the reaction kinetics of titanium films on large-grained aluminium substrates during furnace annealing in vacuum for temperatures between 450–550°C. Oxygen was profiled by elastic resonance16O(α, α)16O backscattering. A TiAl3 aluminide layer always forms at the Ti/Al interface. In addition, a second TiAl3 layer grows at the free Ti surface when the contamination of the annealing ambient by oxygen-carrying species is reduced during annealing. Otherwise, the nucleation of the second compound layer is inhibited by an oxygen-rich surface layer of the Ti.
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