A model for high temperature deformation of nanolaminate Cu-Nb composites

Avallone, Jaclyn T.; Nizolek, Thomas Joseph; Pollock, Tresa Marie; Begley, Matthew R.

doi:10.1016/j.msea.2019.06.026

Title: A model for high temperature deformation of nanolaminate Cu-Nb composites

Abstract

Nanolaminate composites with layer thicknesses down to 65 nm display conventional 3 stage creep behavior with creep resistance increasing as layer thickness decreases. A model for the time dependent high temperature deformation response of Cu-Nb composites is developed, and compared to creep tests performed on multilayers fabricated via accumulative roll bonding (ARB). The model assumes a continuous laminate structure of 50 % Cu and 50 % Nb in which deformation is controlled by stage II creep for the copper ( $$\dot{ε}$$_cr = Aσⁿ) and plasticity in Nb. Regimes in which composite steady-state creep at constant stress can be achieved are identi ed. The modeling illustrates that strain-hardening in the niobium plays a critical role in the transient response of the multilayer, which can dominate the creep lifetime. The combination of experiments and models strongly suggest that dislocation climb mechanisms in the copper control the time-response at 400 °C for all layer thicknesses tested.

Authors:

Avallone, Jaclyn T. ^[1];

^[2]; Pollock, Tresa Marie ^[1]; Begley, Matthew R. ^[1]

Univ. of California, Santa Barbara, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: Thu Jun 20 00:00:00 EDT 2019

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of California, Santa Barbara, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1530796

Alternate Identifier(s):: OSTI ID: 1668298; OSTI ID: 1703699

Report Number(s):: LA-UR-18-29111
Journal ID: ISSN 0921-5093

Grant/Contract Number:: 89233218CNA000001; NA0003857

Resource Type:: Accepted Manuscript

Journal Name:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

Additional Journal Information:: Journal Volume: 761; Journal Issue: C; Journal ID: ISSN 0921-5093

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Cu-Nb; Multilayer composite; Creep model; Strain hardening; Cu-Nb, Multilayer Composite, Creep Model, Strain Hardening

Citation Formats


                    Avallone, Jaclyn T., Nizolek, Thomas Joseph, Pollock, Tresa Marie, and Begley, Matthew R. A model for high temperature deformation of nanolaminate Cu-Nb composites.  United States: N. p., 2019. 
Web.  doi:10.1016/j.msea.2019.06.026.

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                    Avallone, Jaclyn T., Nizolek, Thomas Joseph, Pollock, Tresa Marie, & Begley, Matthew R. A model for high temperature deformation of nanolaminate Cu-Nb composites.  United States.  https://doi.org/10.1016/j.msea.2019.06.026

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                    Avallone, Jaclyn T., Nizolek, Thomas Joseph, Pollock, Tresa Marie, and Begley, Matthew R. Thu .  
"A model for high temperature deformation of nanolaminate Cu-Nb composites".  United States.  https://doi.org/10.1016/j.msea.2019.06.026.  https://www.osti.gov/servlets/purl/1530796.

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@article{osti_1530796,

  title        = {A model for high temperature deformation of nanolaminate Cu-Nb composites},

  author       = {Avallone, Jaclyn T. and Nizolek, Thomas Joseph and Pollock, Tresa Marie and Begley, Matthew R.},

  abstractNote = {Nanolaminate composites with layer thicknesses down to 65 nm display conventional 3 stage creep behavior with creep resistance increasing as layer thickness decreases. A model for the time dependent high temperature deformation response of Cu-Nb composites is developed, and compared to creep tests performed on multilayers fabricated via accumulative roll bonding (ARB). The model assumes a continuous laminate structure of 50 % Cu and 50 % Nb in which deformation is controlled by stage II creep for the copper ( $\dot{ε}$cr = Aσn) and plasticity in Nb. Regimes in which composite steady-state creep at constant stress can be achieved are identi ed. The modeling illustrates that strain-hardening in the niobium plays a critical role in the transient response of the multilayer, which can dominate the creep lifetime. The combination of experiments and models strongly suggest that dislocation climb mechanisms in the copper control the time-response at 400 °C for all layer thicknesses tested.},

  doi          = {10.1016/j.msea.2019.06.026},

  journal      = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},

  number       = C,

  volume       = 761,

  place        = {United States},

  year         = {Thu Jun 20 00:00:00 EDT 2019},

  month        = {Thu Jun 20 00:00:00 EDT 2019}

}

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Cited by: 5 works

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Figures / Tables:

Figure 1: Cu-Nb composite structures are shown for laminates with nominal length scales 8 µm (a), 2 µm (b), 200 nm (c), and 65 nm (d). Full composite stress-strain curves at 400 °C for a variety of length scales are shown in full (e), and truncated to show Ramberg-Osgood hardeningmore » curve fits (f).

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