期刊
ACTA MATERIALIA
卷 58, 期 15, 页码 5196-5205出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.05.055
关键词
Nanocrystalline Cu; Strain rate sensitivity; Grain boundary sliding; Deformed microstructure; Nanoindentation
资金
- National Basic Research Program of China [2010CB631002, 2006CB601201]
- National Natural Science Foundation of China [50501019, 50701034, 10825210]
- National 111 Project of China [B06024]
- Program for New Century Excellent Talents in University [NCET-07-0665]
- Fundamental Research Funds for the Central Universities
The creep behavior of nanocrystalline copper was experimentally characterized with nanoindentation using two sequential regimes, i.e., loading and holding. Significantly enhanced strain rate sensitivity was found within an unusually narrow range of creep rate in the holding regime, which is attributed to the deformed microstructure generated during the loading regime. By quantitatively analyzing the creep rate and rate sensitivity exponent of NC Cu in the holding regime, both the grain boundary sliding (GBS) and dislocation activities are found to be responsible for the observed abnormal behavior, with the contribution of GBS decreasing with increasing grain size and increasing with decreasing loading strain rate. These findings provide a potential way of adjusting the mechanical properties of nanocrystalline metals by pre-straining. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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