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arXiv · 1805.04742

Influence of temperature on the strain rate sensitivity and deformation mechanisms of nanotwinned Cu

L. W. Yang·C. Y. Wang·M. A. Monclús·L. Lu·J. M. Molina-Aldareguía·J. LLorca
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Abstract

The mechanical behavior of nanotwinned Cu was studied through indentation creep and constant strain rate indentation tests from 25 $^\circ$C to 200 $^\circ$C. The results showed an enhanced strain rate sensitivity of nanotwinned Cu with temperature, which was higher than that found in coarse-grained Cu. Transmission electron microscopy revealed the same deformation mechanism in the whole temperature range: confined dislocation slip between coherent twin boundaries and formation of dislocation pile-ups at the coherent twin boundaries. The mechanisms responsible for large increase in strain rate sensitivity of nanotwinned Cu with temperature were discussed to the light of experimental observations.

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L. W. Yang, C. Y. Wang, M. A. Monclús, L. Lu, J. M. Molina-Aldareguía, J. LLorca. 2018-05-12. Influence of temperature on the strain rate sensitivity and deformation mechanisms of nanotwinned Cu. https://doi.org/10.1016/j.scriptamat.2018.05.018

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