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Low-frequency internal-friction in alpha-brass single crystals in the microplastic region at(80÷300) K
Summary
This study of alpha-brass single crystals found that energy loss during cyclic loading arises from dislocations bowing through heterogeneous internal stress fields containing energy barriers of distributed heights. These findings concern metal internal friction physics and have no relevance to environmental microplastic pollution or human health.
The energy loss per cycle of tension/compression was studied in 85/15 alpha-brass single crystals at amplitudes not exceeding the macroscopic flow stress, over the frequency range (0.015÷0.80) Hz at (80÷300) K. Its dependence on temperature, frequency and amplitude is shown to be consistent with a model in which both, the hysteretic and the frequency-dependent contribution to the loss, arise from work expended by bowing dislocations in migrating through the heterogeneous internal stress fields, which contain energy barriers with a distribution of heights. The results are similar to corresponding ones previously obtained with polycrystalline copper and alpha-brasses.