Abstract
The role of alloying elements and the effect of prior cold work on microstructural evolution in Supral type alloys during high temperature straining has been investigated by examining a range of binary and ternary alloys containing varying amounts of Cu and/or Zr. After hot compression, specimens were rapidly cooled to retain the evolved structure and then examined using a range of techniques including optical microscopy, electron microscopy (scanning and transmission), and boundary misorientation measurements from electron backscattering patterns. The high temperature evolution of a fine grain, high angle boundary structure, without nucleation, and growth, was seen to be strain induced and required prior work and the presence of both Cu and Zr. Of the various mechanisms which have been proposed for the continuous recrystallisation of Supral type alloys, the present work is consistent with the importance of strain induced geometrical dynamic recrystallisation in microstructural evolution, and has identified the role of the alloying additions and the processing variables.
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