The structures after solution soaking of five copper-bearing alloys (two falling within the AA 2014 specification) have been examined and related to the structures after extrusion. Variations along the length and radially are documented, and it is shown that the indirect process yields a more homogeneous structure. The factors affecting peripheral recrystallization are discussed and it is shown that variations in the preheat practice, the extrusion mode and process parameters, and the container temperature may each be used as a means of producing the desired structure.
MST/508
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