Abstract
The strain-amplitude dependence of internal friction in Cu–Ni–P alloys has been investigated to evaluate nondestructively the stress relaxation resistance. Annealing at 250 °C after cold rolling causes a suppression of the strain-amplitude dependence with increasing annealing time in the range between 10 and 10 4 s. It is revealed that the stress relaxation resistance linearly improves as the microplastic strain evaluated from the amplitude-dependent internal friction decreases.
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