Abstract
Ruthenium single crystals oriented for single slip on (11̄00) were deformed by compression at room temperature. Two-stage shear stress-shear strain curves with approximately linear ratesof work hardening were observed. The dislocation distribution formed during stage 1 consisted of bundles containing primary edge dipoles while the stage 2 dislocation structure consisted of primary-secondary prism dislocation tangles lying between tight edge multipoles. Cross-slip activity on (0001) was detected during stages 1 and 2. Dislocations with non-basal Burgers vectors were not found in either stage. The results of this study compare more favorably with the stage 1 work hardening theory proposed by Hirsch and Lally than with any other, wherein the flow stress is controlled by the long-range stress field of multipoles containing excess, unpaired dislocations.
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