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This content will become publicly available on August 29, 2018

Title: Deformation Mechanism Map of Cu/Nb Nanoscale Metallic Multilayers as a Function of Temperature and Layer Thickness

The mechanical properties and deformation mechanisms of Cu/Nb nanoscale metallic multilayers (NMMs) manufactured by accumulative roll bonding are studied at 25°C and 400°C. Cu/Nb NMMs with individual layer thicknesses between 7 nm and 63 nm were tested by in situ micropillar compression inside a scanning electron microscope. Yield strength, strain-rate sensitivities and activation volumes were obtained from the pillar compression tests. The deformed micropillars were examined under scanning and transmission electron microscopy in order to examine the deformation mechanisms active for different layer thicknesses and temperatures. The paper suggests that room temperature deformation was determined by dislocation glide at larger layer thicknesses and interface-related mechanisms at the thinner layer thicknesses. The high-temperature compression tests, in contrast, revealed superior thermo-mechanical stability and strength retention for the NMMs with larger layer thicknesses with deformation controlled by dislocation glide. A remarkable transition in deformation mechanism occurred as the layer thickness decreased, to a deformation response controlled by diffusion processes along the interfaces, which resulted in temperature-induced softening. Finally, a deformation mechanism map, in terms of layer thickness and temperature, is proposed from the results obtained in this investigation.
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  1. IMDEA Materials Inst., Getafe (Spain)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of California, Santa Barbara, CA (United States)
  4. IMDEA Materials Inst., Getafe (Spain); Polytechnic Univ. of Madrid (Spain). Dept. of Materials Science
Publication Date:
Report Number(s):
Journal ID: ISSN 1047-4838; TRN: US1800903
Grant/Contract Number:
AC52-06NA25396; CMMI-1729887; 669141
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 69; Journal Issue: 11; Journal ID: ISSN 1047-4838
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); IMDEA Materials Inst., Getafe (Spain)
Sponsoring Org:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); European Research Council (ERC)
Country of Publication:
United States
OSTI Identifier: