Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 545, Issue -, Pages 118-122Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.03.009
Keywords
Phase transition; Cu/Nb nanostructured multilayer; Mechanical properties
Categories
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]
- China Scholarship Council (CSC)
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The phase transition of Nb from body-centered cubic (bcc) to face-centered cubic (fcc) has been found in Cu/Nb nanostructured multilayers with modulation period (lambda) spanning from 5 to 300 nm, and was analyzed by using a thermodynamic model. As lambda decreases, the strength of multilayers increase and approach saturation of similar to 2.88 GPa at a few nm layer thickness. Size dependent strengthening in present fcc/fcc Cu/Nb multilayers is explained in terms of dislocation based strengthening mechanisms. The enhanced modulus of fcc/fcc Cu/Nb is also observed. (C) 2012 Elsevier B.V. All rights reserved.
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