Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 493, Issue 1-2, Pages 274-282Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.08.089
Keywords
nanocomposite; tension test; multilayers; high-temperature deformation
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Freestanding Cu/Nb multilayers with 60 nm layer thickness were tested in tension at temperatures ranging from 20 degrees C to 700 degrees C at strain rates on the order of 1 x 10(-4) s(-1). At room temperature, the composite exhibited high strength (1.2 GPa) and 5% plastic strain to failure, while at the upper temperature regions tested (700 degrees C); the composite underwent elongation to 0.3 true strain at a flow stress of 200 MPa. At all temperatures tested, tensile strength of the composite exceeded the rule-of-mixtures estimate by up to an order of magnitude. Additionally, post-mortem cross-sectional transmission electron microscopy analysis of samples taken from both the deformed gage and undeformed shoulder regions show retention of the initial layered morphology. Strengthening mechanisms are discussed in terms of the confined layer slip model, with the trend of decreased strength and increased ductility with increasing temperature attributed to enhanced cross slip and climb of dislocations across interlayer boundaries. (C) 2008 Published by Elsevier B.V.
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