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Title: Creep Resistance of Bulk Copper-Niobium Composites: an Inverse Effect of Multilayer Length Scale

Abstract

We present that metallic multilayer systems show promising performance in extreme environments, with high stability of bi-metal interfaces down to nanometer length scales. The creep behavior of bulk, accumulative roll bonded (ARB) Copper-Niobium (Cu-Nb) composites has been studied at 400 °C as a function of layer thickness, ranging from 2μm to 65μm. Similar to single phase metallic systems, three regimes are observed during creep: transient, steady-state and tertiary. The mechanism controlling minimum creep rate for all conditions tested has a strong dependence on stress, consistent with dislocation-dominated creep. Additionally, unlike the conventional effect of grain size on creep resistance, this study reveals that decreasing length scale increases creep resistance.

Authors:
 [1]; ORCiD logo [2];  [1];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; Laboratory Directed Research & Development (LDRD)
OSTI Identifier:
1530774
Report Number(s):
LA-UR-18-21753
Journal ID: ISSN 1359-6454
Grant/Contract Number:  
89233218CNA000001; NA0003857
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Name: Acta Materialia; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Cu-Nb; Creep; Multilayer; Length Scale

Citation Formats

Avallone, Jaclyn T., Nizolek, Thomas Joseph, Bales, Benjamin B., and Pollock, Tresa Marie. Creep Resistance of Bulk Copper-Niobium Composites: an Inverse Effect of Multilayer Length Scale. United States: N. p., 2019. Web. doi:10.1016/j.actamat.2019.06.029.
Avallone, Jaclyn T., Nizolek, Thomas Joseph, Bales, Benjamin B., & Pollock, Tresa Marie. Creep Resistance of Bulk Copper-Niobium Composites: an Inverse Effect of Multilayer Length Scale. United States. doi:10.1016/j.actamat.2019.06.029.
Avallone, Jaclyn T., Nizolek, Thomas Joseph, Bales, Benjamin B., and Pollock, Tresa Marie. Sat . "Creep Resistance of Bulk Copper-Niobium Composites: an Inverse Effect of Multilayer Length Scale". United States. doi:10.1016/j.actamat.2019.06.029.
@article{osti_1530774,
title = {Creep Resistance of Bulk Copper-Niobium Composites: an Inverse Effect of Multilayer Length Scale},
author = {Avallone, Jaclyn T. and Nizolek, Thomas Joseph and Bales, Benjamin B. and Pollock, Tresa Marie},
abstractNote = {We present that metallic multilayer systems show promising performance in extreme environments, with high stability of bi-metal interfaces down to nanometer length scales. The creep behavior of bulk, accumulative roll bonded (ARB) Copper-Niobium (Cu-Nb) composites has been studied at 400 °C as a function of layer thickness, ranging from 2μm to 65μm. Similar to single phase metallic systems, three regimes are observed during creep: transient, steady-state and tertiary. The mechanism controlling minimum creep rate for all conditions tested has a strong dependence on stress, consistent with dislocation-dominated creep. Additionally, unlike the conventional effect of grain size on creep resistance, this study reveals that decreasing length scale increases creep resistance.},
doi = {10.1016/j.actamat.2019.06.029},
journal = {Acta Materialia},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
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This content will become publicly available on June 22, 2020
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