Abstract
The tweed microstructure in aged copper-beryllium alloys has usually been associated with the formation of disk-shaped Guinier-Preston zones on {100} planes, and the coherency strain fields surrounding them. However, tweed contrast and/or diffraction effects have been observed by electron microscopy in as-quenched material and in samples subjected to reversion treatment in which the GP zones redissolve. A Cu-1 wt. % Be alloy has been examined by transmission electron microscopy and diffraction to test the hypothesis that GP zones are not responsible for the tweed contrast.
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