Journal
MECHANICS OF MATERIALS
Volume 61, Issue -, Pages 1-10Publisher
ELSEVIER
DOI: 10.1016/j.mechmat.2013.02.003
Keywords
Ultrafine-grained materials; Mechanical behavior; Strain rate sensitivity; Temperature dependence; Rate-controlling mechanism
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Funding
- National Science Foundation of China [11272267, 10902090, 10932008]
- Basic Research Foundation [JC201001]
- Northwestern Polytechnical University [B07050]
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In the present work, we systematically investigated the mechanical behaviors of ultrafine grained copper under quasi-static and dynamic loading conditions at temperatures ranging from 77 to 573 K. Based on experimental results, we explore the coupling effect of strain rate and temperature on the plastic deformation of ultrafine grained copper. The strain rate, temperature sensitivity and the apparent activation volume have been determined. The results indicate that the flow stress of ultrafine-grained copper shows enhanced sensitivity to both testing temperature and strain rate comparing with its coarse grained counterpart. Meanwhile, the strain rate sensitivity also increases with rising temperature while the temperature sensitivity seems to decrease with increasing strain rate. The estimated thermal activation volume of ultrafine-grained copper is about on the order of similar to 10b(3), which is of the same order with that for grain boundary diffusion-controlled processes. However, it is concluded that such processes should be ruled out as the dominant mechanisms under our experimental temperature and strain rate conditions. Instead, thermal activated dislocation interaction appears to be the dominant rate-controlling mechanism. (C) 2013 Elsevier Ltd. All rights reserved.
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