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Temperature and Strain Rate Dependence of Flow Stress in Severely Deformed Copper by Accumulative Roll Bonding

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Figure

Fig. 2The relationship between the strain rate sensitivity m and the trueshear stress � at RT for the conventional polycrystals (the annealed Cubefore ARB), the specimens ARB processed by various cycles and thesingle crystal specimens.
Fig. 5The relationship between m and T. The curves in this figure givingthe T dependence of m are obtained by considering m at certain strains, i.e.," ¼ 0:01 for the specimens ARB processed by 4, 6 and 8 cycles, " ¼ 0:15for the annealed Cu before ARB and " ¼ 0:02 for the single crystals.
Fig. 7The activation volume V� as a function of the temperature T. Theprevious results for vapor deposited Cu (d ¼ 500 nm) shown in theliterature5) are also indicated.
Fig. 8The schematic illustration showing the shapes of bowing-outdislocations emitted from grain-boundary sources between pinningobstacles (a) at low temperature, (b) at room temperature.

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