Zhou Xu1 and Taku Sakai2
1Graduate Student, The University of Electro-Communications, Chofu
The effect of single and multiple peak dynamic recrystallization (DRX) on the static softening taking place in hot deformed copper was studied by means of the interrupted compression test at a temperature of 723 K and a true strain rate of 2× 10-3 s-1. The softening curve after dynamic recovery consists of two stages followed by complete softening. In contrast, the softening curve after DRX consists of three distinct stages with the respective inflection plateaus, followed by incomplete softening. Under a single peak DRX, the softening curve changes monotonically with straining from a sigmoidal to three distinct stages. Under a multiple peak DRX, the softening behavior changes periodically with straining, which can roughly correspond to the appearance of multiple peak flow. It is concluded that the static softening after DRX is sensitively affected by not only the volume fraction of DRX structure in the deformed matrix, but also the distribution of three kinds of DRX grains, i. e. DRX nuclei, growing DRX grains and strain hardened DRX grains.
hot deformation, static softening, copper, single and multiple peak dynamic recrystallization, metadynamic recovery and recrystallization
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