Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 18, Pages 5908-5913Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.04.009
Keywords
Multilayer; Strain rate sensitivity; Nanoindentation; Grain size; Grain boundary
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Funding
- National Basic Research Program of China [2011CB610306, 2010CB631002]
- National Natural Science Foundation of China [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
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Nanoscaled bimetallic Cu/Ta multilayers were fabricated and their deformation behaviors characterized under nanoindentation. The individual Cu and Ta layers had equal thickness (similar to 30 nm) but quite different grain sizes. By evaluating the hardness of the bi-metal system at various strain rates, a transitional point of its strain rate sensitivity at the strain rate of 10(-3) s(-1) was observed. Contributions from dislocation and grain boundary (GB) motions to plastic deformation are found to be strongly dependent upon strain rate as well as grain size in alternative constituent layers. Whilst dislocation-mediated motions take up the majority of deformation in a Cu/Ta multilayer at high strain rates, GB motions occurring mainly in the Ta layers take over at low strain rates. (C) 2011 Elsevier B.V. All rights reserved.
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