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Title: DUCTILE-PHASE TOUGHENED TUNGSTEN FOR PLASMA-FACING MATERIALS IN FUSION REACTORS

Abstract

Tungsten (W) and W-alloys are the leading candidates for plasma-facing components in nuclear fusion reactor designs because of their high melting point, strength retention at high temperatures, high thermal conductivity, and low sputtering yield. However, tungsten is brittle and does not exhibit the required fracture toughness for licensing in nuclear applications. A promising approach to increasing fracture toughness of W-alloys is by ductile-phase toughening (DPT). In this method, a ductile phase is included in a brittle matrix to prevent on inhibit crack propagation by crack blunting, crack bridging, crack deflection, and crack branching. Model examples of DPT tungsten are explored in this study, including W-Cu and W-Ni-Fe powder product composites. Three-point and four-point notched and/or pre-cracked bend samples were tested at several strain rates and temperatures to help understand deformation, cracking, and toughening in these materials. Data from these tests are used for developing and calibrating crack-bridging models. Finite element damage mechanics models are introduced as a modeling method that appears to capture the complexity of crack growth in these materials.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1390424
Report Number(s):
PNNL-SA-122073
Journal ID: ISBN 9781339471761; AT2030110
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Powder Metallurgy, 53(2):53-69; Journal Volume: 53; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
Tungsten; Tungsten composites; Ductile Phase Toughening; Fusion Materials; fracture and deformation; model and simulation

Citation Formats

Henager, Charles H., Setyawan, Wahyu, Roosendaal, Timothy J., Overman, Nicole R., Borlaug, Brennan A., Stevens, Erica L., Wagner, Karla B., Kurtz, Richard J., Odette, G Robert, Nguyen, Ba Nghiep, and Cunningham, Kevin. DUCTILE-PHASE TOUGHENED TUNGSTEN FOR PLASMA-FACING MATERIALS IN FUSION REACTORS. United States: N. p., 2017. Web.
Henager, Charles H., Setyawan, Wahyu, Roosendaal, Timothy J., Overman, Nicole R., Borlaug, Brennan A., Stevens, Erica L., Wagner, Karla B., Kurtz, Richard J., Odette, G Robert, Nguyen, Ba Nghiep, & Cunningham, Kevin. DUCTILE-PHASE TOUGHENED TUNGSTEN FOR PLASMA-FACING MATERIALS IN FUSION REACTORS. United States.
Henager, Charles H., Setyawan, Wahyu, Roosendaal, Timothy J., Overman, Nicole R., Borlaug, Brennan A., Stevens, Erica L., Wagner, Karla B., Kurtz, Richard J., Odette, G Robert, Nguyen, Ba Nghiep, and Cunningham, Kevin. Mon . "DUCTILE-PHASE TOUGHENED TUNGSTEN FOR PLASMA-FACING MATERIALS IN FUSION REACTORS". United States. doi:.
@article{osti_1390424,
title = {DUCTILE-PHASE TOUGHENED TUNGSTEN FOR PLASMA-FACING MATERIALS IN FUSION REACTORS},
author = {Henager, Charles H. and Setyawan, Wahyu and Roosendaal, Timothy J. and Overman, Nicole R. and Borlaug, Brennan A. and Stevens, Erica L. and Wagner, Karla B. and Kurtz, Richard J. and Odette, G Robert and Nguyen, Ba Nghiep and Cunningham, Kevin},
abstractNote = {Tungsten (W) and W-alloys are the leading candidates for plasma-facing components in nuclear fusion reactor designs because of their high melting point, strength retention at high temperatures, high thermal conductivity, and low sputtering yield. However, tungsten is brittle and does not exhibit the required fracture toughness for licensing in nuclear applications. A promising approach to increasing fracture toughness of W-alloys is by ductile-phase toughening (DPT). In this method, a ductile phase is included in a brittle matrix to prevent on inhibit crack propagation by crack blunting, crack bridging, crack deflection, and crack branching. Model examples of DPT tungsten are explored in this study, including W-Cu and W-Ni-Fe powder product composites. Three-point and four-point notched and/or pre-cracked bend samples were tested at several strain rates and temperatures to help understand deformation, cracking, and toughening in these materials. Data from these tests are used for developing and calibrating crack-bridging models. Finite element damage mechanics models are introduced as a modeling method that appears to capture the complexity of crack growth in these materials.},
doi = {},
journal = {International Journal of Powder Metallurgy, 53(2):53-69},
number = 2,
volume = 53,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}