Abstract
The aim of the work is to elucidate the mechanisms of discontinuous precipitation (DP) in an Al–2.8 at.% Ag–1 at.% Ga alloy, which has a relatively small coherency strain energy. Besides in situ TEM investigations, microtexture measurements were carried out using the EBSD technique. Characteristic misorientation relationships (25°–40°{〈115〉 and 〈332〉}) were found between grains with a propensity for discontinuous precipitation. This is attributed to the anisotropy of interface boundary energy, as first pointed out by Tu and Turnbull ( Acta Metallurgica, 1967, 15, 369). The interpretation is supported by particle–boundary orientation relationships revealed in the TEM at the incipient stages of DP.
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