Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 6, Pages 2982-2987Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.12.054
Keywords
Nanostructured multilayers; Fracture mode; Constraint effects; Length scale
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Funding
- 973 Program of China [2010CB631003]
- 111 Project of China [B06025]
- National Natural Science Foundation of China [50971097]
- Fundamental Research Funds for the Central Universities
- Program for New Century Excellent Talents in University [NCET-10-0876]
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It was recently suggested that the fracture mode in nanostructured metallic multilayer films (NMFs) is related to the strengthening mechanism. Here, based on extensive experimental examinations on the nanoscale damage of Cu/Cr NMFs with wide ranges of modulation period (from 10 nm to 250 nm) and modulation ratio (from 0.11 to 3.0), we conclude that the dominant factor controlling the fracture mode in NMFs is the constraint effect from the ductile layer on the brittle layer, rather than the strengthening mechanism. This constraint effect is quantitatively assessed using a fracture mechanism-based micromechanical model, which yields predictions in broad agreement with the experimental observations. (C) 2010 Elsevier B.V. All rights reserved.
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