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In-Situ Grain Resolved Stress Characterization During Damage Initiation in Cu-10%W Alloy

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Abstract

The evolution of stress during damage initiation and accumulation in a two-phase alloy consisting of a ductile copper (Cu) matrix with a randomly dispersed brittle tungsten (W) phase was studied using multiple non-destructive experimental probes. Neutron diffraction measurements were performed to examine the macroscopic strain partitioning between the two phases during a uniaxial tension test. The same material was then examined with high-energy x-ray diffraction microscopy (HEDM) and micro-computed tomography (\(\mu \hbox {-CT}\)) measurements to monitor micromechanical field evolution. The neutron diffraction data indicated a redistribution of load between the Cu and W phases as deformation proceeds. Using HEDM to monitor individual grain micromechanical behavior, an increase followed by decrease in hydrostatic stress and a similar stress triaxiality behavior were found to occur in a subset of W grains. These same W grains were found to be in close proximity to voids observed via tomography at later stages of deformation. From these observations, we conclude that high stress triaxiality development in the W particles leads to decohesion of the interface between the Cu and W phases. The debonded regions eventually grew and coalesced with neighboring voids leading to material failure.

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Acknowledgements

This work was supported by the US Department of Energy through the Los Alamos National Laboratory. Los Alamos National Laboratory is operated by Triad National Security, LLC for the National Nuclear Security Administration of the US Department of Energy (contract no. 89233218CNA000001), specifically the Laboratory Directed Research and Development (LDRD) program (Project 20140114DR) and Science Campaign 2. The use of F2 Beamline at CHESS and SMARTS Beamline at LANSCE is also acknowledged. CHESS is supported by the NSF award DMR-1332208.

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Authors and Affiliations

  1. Los Alamos National Laboratory, Los Alamos, NM, 87544, USA

    Reeju Pokharel, Ricardo A. Lebensohn, Timothy L. Ickes, Bjørn Clausen, Donald W. Brown & Ching-Fong Chen

  2. Cornell High-Energy Synchrotron Source, Cornell University, Ithaca, NY, 14853, USA

    Darren C. Pagan & Darren S. Dale

  3. Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA

    Joel V. Bernier

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  1. Reeju Pokharel
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  2. Ricardo A. Lebensohn
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Correspondence to Reeju Pokharel.

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Pokharel, R., Lebensohn, R.A., Pagan, D.C. et al. In-Situ Grain Resolved Stress Characterization During Damage Initiation in Cu-10%W Alloy. JOM 72, 48–56 (2020). https://doi.org/10.1007/s11837-019-03692-5

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  • DOI: https://doi.org/10.1007/s11837-019-03692-5

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