Abstract
In the CuAl system for aluminium concentrations between 30.8 and 40.9 at.% several structures occur which are related to the γ-brass structure. Electron microscopy, electron diffraction and high resolution imaging techniques were used to analyse these phases; apart from the previously described P- and R-type γ-brass phases a new long-period inversion boundary superstructure was discovered. This new phase was observed for alloy compositions intermediate between those corresponding to P-type and R-type γ-brass. Cooling experiments were performed to investigate the stability of this superstructure at room temperature. It was observed that after very slow cooling from 700 °C to room temperature a decomposition into P- and R-type γ-brass occurred. The results are discussed in terms of the stability of the γ-brass and related structures.
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