Title: Timing and duration of hydrological transitions in Arctic polygonal ground from stable isotopes

Abstract

Both simulations and experiments have suggested that Cu/CuZr nanolaminates are stronger and more ductile than their individual constituents due to interface-mediated interactions between plasticity carriers. In this work, we use the effective-temperature theories of dislocation and amorphous shear-transformation-zone (STZ) plasticity to study amorphous-crystalline interface (ACI)-mediated plasticity in Cu/CuZr nanolaminates under mechanical straining. The model is shown to capture reasonably well the measured deformation response when strained either in tension parallel to or in compression normal to the amorphous-crystalline interface. Our analysis indicates that increasing CuZr or decreasing Cu layer thickness increases the maximum flow stress for both perpendicular and parallel loading cases. Furthermore, for the cases of parallel and perpendicular loading, the maximum flow stress values are 3.4 and 2.5GPa, respectively. Furthermore, increasing the strain rate for the parallel loading case decreases the slip strain in the amorphous and crystalline layers. Additionally, for the perpendicular loading case, an increase in strain rate decreases the amorphous layer slip but increases the crystalline layer slip. In all slip strain analyses, maximum slip strain occurs at the ACI, thus indicating that plasticity carriers accumulate at the interface and are absorbed there. These findings indicate a significant anisotropy in strength with greater sensitivity tomore » layer thickness for the case of tensile loading parallel to the ACI. Further findings signify that slip strain is more sensitive when the nanolaminate is compressed perpendicular to the ACI.« less

Authors:

Conroy, Nathan Alec  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-0597-3373"

Newman, Brent David  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-9177-8675"

Heikoop, Jeffrey Martin  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-7648-3385"

Perkins, George Bradford  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-5948-4893"

Feng, Xiahong ^[2]; Wilson, Cathy Jean  ^[1];

• Search DOE PAGES for author "Wilson, Cathy Jean"
• Search DOE PAGES for ORCID "0000-0001-9896-0912"

Wullschleger, Stan Duane  ^[3]

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• Search DOE PAGES for ORCID "0000-0002-9869-0446"

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+ Show Author Affiliations

1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Dartmouth College, Hanover, NH (United States)
3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:

Tue Nov 05 00:00:00 EST 2019

Research Org.:

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE National Nuclear Security Administration (NNSA)

Contributing Org.:

Next-Generation Ecosystem Experiments (NGEE) Arctic Project

OSTI Identifier:

1601399

Alternate Identifier(s):

OSTI ID: 1573842; OSTI ID: 1669774

Report Number(s):

LA-UR-19-22686
Journal ID: ISSN 0885-6087

Grant/Contract Number:  

89233218CNA000001; AC05-00OR22725

Resource Type:

Accepted Manuscript

Journal Name:

Hydrological Processes

Additional Journal Information:

Journal Volume: 34; Journal Issue: 3; Journal ID: ISSN 0885-6087

Publisher:

Wiley

Country of Publication:

United States

Language:

English

Subject:

58 GEOSCIENCES; Earth sciences; Arctic Coastal Plain; arctic hydrology; Barrow; hydrological transitions; polygonal ground; stable water isotopes; tundra; Utqiaġvik