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Title: Residual stress within nanoscale metallic multilayer systems during thermal cycling

Abstract

Projected applications for nanoscale metallic multilayers will include wide temperature ranges. Since film residual stress has been known to alter system reliability, stress development within new film structures with high interfacial densities should be characterized to identify potential long-term performance barriers. To understand factors contributing to thermal stress evolution within nanoscale metallic multilayers, stress in Cu/Nb systems adhered to Si substrates was calculated from curvature measurements collected during cycling between 25 °C and 400 °C. Additionally, stress within each type of component layers was calculated from shifts in the primary peak position from in-situ heated X-ray diffraction. The effects of both film architecture (layer thickness) and layer order in metallic multilayers were tracked and compared with monolithic Cu and Nb films. Analysis indicated that the thermoelastic slope of nanoscale metallic multilayer films depends on thermal expansion mismatch, elastic modulus of the components, and also interfacial density. The layer thickness (i.e. interfacial density) affected thermoelastic slope magnitude while layer order had minimal impact on stress responses after the initial thermal cycle. When comparing stress responses of monolithic Cu and Nb films to those of the Cu/Nb systems, the nanoscale metallic multilayers show a similar increase in stress above 200 °C tomore » the Nb monolithic films, indicating that Nb components play a larger role in stress development than Cu. Local stress calculations from X-ray diffraction peak shifts collected during heating reveal that the component layers within a multilayer film respond similarly to their monolithic counterparts.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Clemson Univ., Clemson, SC (United States)
  2. Austrian Academy of Sciences and Dept. of Materialphysik, Montanuniversitaet Leoben, Leoben (Austria)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1221731
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 648; Conference: San Jose, California United States, 8-13 June 2014; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; residual stress; metal multilayers; copper-niobium; thin films; nanoscale metallic multilayers; thermomechanical processing; residual stresses; thermal expansion mismatch

Citation Formats

Economy, David Ross, Cordill, Megan Jo, Payzant, E. Andrew, and Kennedy, Marian S. Residual stress within nanoscale metallic multilayer systems during thermal cycling. United States: N. p., 2015. Web. doi:10.1016/j.msea.2015.09.082.
Economy, David Ross, Cordill, Megan Jo, Payzant, E. Andrew, & Kennedy, Marian S. Residual stress within nanoscale metallic multilayer systems during thermal cycling. United States. https://doi.org/10.1016/j.msea.2015.09.082
Economy, David Ross, Cordill, Megan Jo, Payzant, E. Andrew, and Kennedy, Marian S. Mon . "Residual stress within nanoscale metallic multilayer systems during thermal cycling". United States. https://doi.org/10.1016/j.msea.2015.09.082. https://www.osti.gov/servlets/purl/1221731.
@article{osti_1221731,
title = {Residual stress within nanoscale metallic multilayer systems during thermal cycling},
author = {Economy, David Ross and Cordill, Megan Jo and Payzant, E. Andrew and Kennedy, Marian S.},
abstractNote = {Projected applications for nanoscale metallic multilayers will include wide temperature ranges. Since film residual stress has been known to alter system reliability, stress development within new film structures with high interfacial densities should be characterized to identify potential long-term performance barriers. To understand factors contributing to thermal stress evolution within nanoscale metallic multilayers, stress in Cu/Nb systems adhered to Si substrates was calculated from curvature measurements collected during cycling between 25 °C and 400 °C. Additionally, stress within each type of component layers was calculated from shifts in the primary peak position from in-situ heated X-ray diffraction. The effects of both film architecture (layer thickness) and layer order in metallic multilayers were tracked and compared with monolithic Cu and Nb films. Analysis indicated that the thermoelastic slope of nanoscale metallic multilayer films depends on thermal expansion mismatch, elastic modulus of the components, and also interfacial density. The layer thickness (i.e. interfacial density) affected thermoelastic slope magnitude while layer order had minimal impact on stress responses after the initial thermal cycle. When comparing stress responses of monolithic Cu and Nb films to those of the Cu/Nb systems, the nanoscale metallic multilayers show a similar increase in stress above 200 °C to the Nb monolithic films, indicating that Nb components play a larger role in stress development than Cu. Local stress calculations from X-ray diffraction peak shifts collected during heating reveal that the component layers within a multilayer film respond similarly to their monolithic counterparts.},
doi = {10.1016/j.msea.2015.09.082},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = ,
volume = 648,
place = {United States},
year = {Mon Sep 21 00:00:00 EDT 2015},
month = {Mon Sep 21 00:00:00 EDT 2015}
}

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