Solid solution hardening evaluated from amplitude-dependent internal friction in polycrystalline copper alloys

Abstract

In the present study, the authors evaluated plastic strain as a function of stress from data of the amplitude-dependent internal friction in polycrystalline Cu alloys under the condition that the flow stress is controlled only by the mobility of dislocations. The polycrystalline alloys were employed as specimens in the measurements, because the amplitude dependence of internal friction is too structure-sensitive to show reproducible results in highly pure monocrystals. In addition, the application of the present evaluation of plastic strain to engineering materials is expected as a new non-destructive strength test. The solute elements were restricted within IVb group and the concentration was fixed at 0.3% in order to examine the dependence of flow stress on the size misfit between solute and solvent atoms.