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Title: Modeling thermal and irradiation-induced swelling effects on the integrity of Ti 3 SiC 2 /SiC joints

Abstract

Previously, results for CVD-SiC joints created using solid state displacement reactions to form a dual-phase SiC/MAX phase irradiated at 800°C and 5 dpa indicated some extent of cracking in the joint and along the CVD-SiC/joint interface. This paper elucidates the origin of cracking by thermomechanical modeling combined with irradiation-induced swelling effects using a continuum damage approach with support of micromechanical modeling. Three irradiation temperatures (400°C, 500°C and 800°C) are considered assuming experimental irradiation doses in a range leading to saturation swelling in SiC. The analyses indicate that a SiC/MAX joint heated to 400°C fails during irradiation-induced swelling at this temperature while it experiences some damage after being heated to 500°C and irradiated at the same temperature. However, it fails during cooling from 500°C to room temperature. The joint experiences minor damage when heated to and irradiated at 800°C but does not fail after cooling. The prediction agrees with the experimental findings available for this case.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1398205
Report Number(s):
PNNL-SA-124282
Journal ID: ISSN 0022-3115; AT2030110
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 495; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
SiC; fusion materials; joining; swelling; neutron irradiation; thermal expansion; damage modeling

Citation Formats

Nguyen, Ba Nghiep, Henager, Charles H., and Kurtz, Richard J.. Modeling thermal and irradiation-induced swelling effects on the integrity of Ti 3 SiC 2 /SiC joints. United States: N. p., 2017. Web. doi:10.1016/j.jnucmat.2017.09.011.
Nguyen, Ba Nghiep, Henager, Charles H., & Kurtz, Richard J.. Modeling thermal and irradiation-induced swelling effects on the integrity of Ti 3 SiC 2 /SiC joints. United States. doi:10.1016/j.jnucmat.2017.09.011.
Nguyen, Ba Nghiep, Henager, Charles H., and Kurtz, Richard J.. Wed . "Modeling thermal and irradiation-induced swelling effects on the integrity of Ti 3 SiC 2 /SiC joints". United States. doi:10.1016/j.jnucmat.2017.09.011.
@article{osti_1398205,
title = {Modeling thermal and irradiation-induced swelling effects on the integrity of Ti 3 SiC 2 /SiC joints},
author = {Nguyen, Ba Nghiep and Henager, Charles H. and Kurtz, Richard J.},
abstractNote = {Previously, results for CVD-SiC joints created using solid state displacement reactions to form a dual-phase SiC/MAX phase irradiated at 800°C and 5 dpa indicated some extent of cracking in the joint and along the CVD-SiC/joint interface. This paper elucidates the origin of cracking by thermomechanical modeling combined with irradiation-induced swelling effects using a continuum damage approach with support of micromechanical modeling. Three irradiation temperatures (400°C, 500°C and 800°C) are considered assuming experimental irradiation doses in a range leading to saturation swelling in SiC. The analyses indicate that a SiC/MAX joint heated to 400°C fails during irradiation-induced swelling at this temperature while it experiences some damage after being heated to 500°C and irradiated at the same temperature. However, it fails during cooling from 500°C to room temperature. The joint experiences minor damage when heated to and irradiated at 800°C but does not fail after cooling. The prediction agrees with the experimental findings available for this case.},
doi = {10.1016/j.jnucmat.2017.09.011},
journal = {Journal of Nuclear Materials},
number = C,
volume = 495,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}