日本金属学会誌

J. Japan Inst. Metals, Vol. 55, No. 11 (1991),
pp. 1182-1188

Effect of Single/Multiple Peak Dynamic Recrystallization on the Static Recovery and Recrystallization of Copper

Zhou Xu1 and Taku Sakai2

1Graduate Student, The University of Electro-Communications, Chofu
2Department of Mechanical and Control Engineering, The University of Electro-Communications, Chofu

Abstract:

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.


(Received 1991/7/9)

Keywords:

hot deformation, static softening, copper, single and multiple peak dynamic recrystallization, metadynamic recovery and recrystallization


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