Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 539, Issue -, Pages 68-73Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.01.046
Keywords
Multilayer films; Multiple twins; Formation mechanism; Strengthening effect
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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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Multiple twins are experimentally observed within Cu grains in nanostructured Cu/Zr multilayer films. Formation of the multiple twins occurs through the sequential emission of partial dislocations not only from the grain boundaries but also from the Cu/Zr interfaces, which are driven by extremely high internal stresses and highly complex stress state caused by the inhomogeneous microstructures. The multilayers with multiple twins exhibit hardness higher than those with single or coplanar twins, indicative of a significant strengthening effect of the multiple twins. (C) 2012 Elsevier B.V. All rights reserved.
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