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Title: A multiscale microstructural approach to ductile-phase toughened tungsten for plasma-facing materials

Increasing fracture toughness and modifying the ductile-brittle transition temperature of a tungsten-alloy relative to pure tungsten has been shown to be feasible by ductile-phase toughening (DPT) of tungsten for future plasma-facing materials for fusion energy. In DPT, a ductile phase is included in a brittle tungsten matrix to increase the overall work of fracture for the material. This research models the deformation behavior of DPT tungsten materials, such as tungsten-copper composites, using a multiscale modeling approach that involves a microstructural dual-phase (copper-tungsten) region of interest where the constituent phases are finely discretized and are described by a continuum damage mechanics model. Large deformation, damage, and fracture are allowed to occur and are modeled in a region that is connected to adjacent homogenized elastic regions to form a macroscopic structure, such as a test specimen. The present paper illustrates this multiscale modeling approach to analyze unnotched and single-edge notched (SENB) tungsten-copper composite specimens subjected to three-point bending. The predicted load-displacement responses and crack propagation patterns are compared to the corresponding experimental results to validate the model. Furthermore, such models may help design future DPT composite configurations for fusion materials, including volume fractions of ductile phase and microstructural optimization.
Authors:
 [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Report Number(s):
PNNL-SA-131463
Journal ID: ISSN 0022-3115; PII: S0022311518300710
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Name: Journal of Nuclear Materials; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Fusion materials; Ductile-phase toughening; damage modeling; Multiscale analysis; crack propagation; Finite element
OSTI Identifier:
1439094

Nguyen, Ba Nghiep, Henager, Jr., Charles H., Overman, Nicole R., and Kurtz, Richard J.. A multiscale microstructural approach to ductile-phase toughened tungsten for plasma-facing materials. United States: N. p., Web. doi:10.1016/j.jnucmat.2018.05.048.
Nguyen, Ba Nghiep, Henager, Jr., Charles H., Overman, Nicole R., & Kurtz, Richard J.. A multiscale microstructural approach to ductile-phase toughened tungsten for plasma-facing materials. United States. doi:10.1016/j.jnucmat.2018.05.048.
Nguyen, Ba Nghiep, Henager, Jr., Charles H., Overman, Nicole R., and Kurtz, Richard J.. 2018. "A multiscale microstructural approach to ductile-phase toughened tungsten for plasma-facing materials". United States. doi:10.1016/j.jnucmat.2018.05.048.
@article{osti_1439094,
title = {A multiscale microstructural approach to ductile-phase toughened tungsten for plasma-facing materials},
author = {Nguyen, Ba Nghiep and Henager, Jr., Charles H. and Overman, Nicole R. and Kurtz, Richard J.},
abstractNote = {Increasing fracture toughness and modifying the ductile-brittle transition temperature of a tungsten-alloy relative to pure tungsten has been shown to be feasible by ductile-phase toughening (DPT) of tungsten for future plasma-facing materials for fusion energy. In DPT, a ductile phase is included in a brittle tungsten matrix to increase the overall work of fracture for the material. This research models the deformation behavior of DPT tungsten materials, such as tungsten-copper composites, using a multiscale modeling approach that involves a microstructural dual-phase (copper-tungsten) region of interest where the constituent phases are finely discretized and are described by a continuum damage mechanics model. Large deformation, damage, and fracture are allowed to occur and are modeled in a region that is connected to adjacent homogenized elastic regions to form a macroscopic structure, such as a test specimen. The present paper illustrates this multiscale modeling approach to analyze unnotched and single-edge notched (SENB) tungsten-copper composite specimens subjected to three-point bending. The predicted load-displacement responses and crack propagation patterns are compared to the corresponding experimental results to validate the model. Furthermore, such models may help design future DPT composite configurations for fusion materials, including volume fractions of ductile phase and microstructural optimization.},
doi = {10.1016/j.jnucmat.2018.05.048},
journal = {Journal of Nuclear Materials},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {5}
}