Heterogeneous microstructure of yttrium hydride and its relation to mechanical properties

Hanns Gietl; Ben Garrison; David J. Sprouster; Takaaki Koyanagi

doi:10.1016/j.jeurceramsoc.2023.01.015

Heterogeneous microstructure of yttrium hydride and its relation to mechanical properties

Hanns Gietl, Ben Garrison, David J. Sprouster, Takaaki Koyanagi

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The goal of this study is to investigate the properties of yttrium hydride materials in relation to the microstructure, especially its homogeneity. High-throughput nanoindentation mapping was used to evaluate hardness distribution. Raman spectral imaging demonstrated its sensitivity to the presence of YH2 and impurities. Raman peak position maps were correlated with residual stress in the specimens. Electron backscatter diffraction mapping provided phase distributions with correlation to high-energy X-ray diffraction analysis. The experimental mapping data were combined and analyzed using unsupervised machine learning cluster procedures. The machine learning analysis revealed that yttrium hydride specimens contained a major δ-YH2 − x phase component and minor α-Y and δ-YH2 − x components with significant residual stress. The minor phase fraction decreased with increasing nominal H/Y ratio, which affected the nanoindentation and Vickers hardness. The multimodal mapping procedures described herein affect developing important microstructure–property relationships, as well as correlations in heterogeneity and mechanical properties.

Original language	English
Pages (from-to)	3216-3227
Number of pages	12
Journal	Journal of the European Ceramic Society
Volume	43
Issue number	8
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2023.01.015
State	Published - Jul 2023

Funding

Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05–00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). This research was supported by the TCR program sponsored by the DOE Office of Nuclear Energy. The research was authored by UT-Battelle under contract no. DE-AC05-00OR22725 with the DOE . This research was supported by the TCR program sponsored by the DOE Office of Nuclear Energy. The research was authored by UT-Battelle under contract no. DE-AC05-00OR22725 with the DOE. The authors thank Xunxiang Hu at ORNL for preparing yttrium hydride specimens. Access to the Raman spectroscopy system was permitted by Andrew Miskowiec at ORNL. The authors also thank Tim Lach, Thak Sang (TS) Byun and Erica Heinrich at ORNL for the discussions, technical review, and editing. Thanks also go to Caitlin Duggan and Travis Dixon for their precise work during mechanical polishing of the specimens. This research used resources at the X-ray Powder Diffraction beamline of the National Synchrotron Light Source II, a DOE Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. David Sprouster was supported by the DOE Office of Fusion Energy Sciences under contract DE-SC0018322 with the Research Foundation for the State University of New York at Stony Brook. The authors thank Xunxiang Hu at ORNL for preparing yttrium hydride specimens. Access to the Raman spectroscopy system was permitted by Andrew Miskowiec at ORNL. The authors also thank Tim Lach, Thak Sang (TS) Byun and Erica Heinrich at ORNL for the discussions, technical review, and editing. Thanks also go to Caitlin Duggan and Travis Dixon for their precise work during mechanical polishing of the specimens. This research used resources at the X-ray Powder Diffraction beamline of the National Synchrotron Light Source II, a DOE Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704 . David Sprouster was supported by the DOE Office of Fusion Energy Sciences under contract DE-SC0018322 with the Research Foundation for the State University of New York at Stony Brook.

Funders	Funder number
U.S. Department of Energy
Office of Science
Office of Nuclear Energy
Fusion Energy Sciences	DE-SC0018322
Oak Ridge National Laboratory
Brookhaven National Laboratory	DE-SC0012704
UT-Battelle	DE-AC05-00OR22725

Keywords

Advanced data analysis
Yttrium hydride

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10.1016/j.jeurceramsoc.2023.01.015

Cite this

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title = "Heterogeneous microstructure of yttrium hydride and its relation to mechanical properties",

abstract = "The goal of this study is to investigate the properties of yttrium hydride materials in relation to the microstructure, especially its homogeneity. High-throughput nanoindentation mapping was used to evaluate hardness distribution. Raman spectral imaging demonstrated its sensitivity to the presence of YH2 and impurities. Raman peak position maps were correlated with residual stress in the specimens. Electron backscatter diffraction mapping provided phase distributions with correlation to high-energy X-ray diffraction analysis. The experimental mapping data were combined and analyzed using unsupervised machine learning cluster procedures. The machine learning analysis revealed that yttrium hydride specimens contained a major δ-YH2 − x phase component and minor α-Y and δ-YH2 − x components with significant residual stress. The minor phase fraction decreased with increasing nominal H/Y ratio, which affected the nanoindentation and Vickers hardness. The multimodal mapping procedures described herein affect developing important microstructure–property relationships, as well as correlations in heterogeneity and mechanical properties.",

keywords = "Advanced data analysis, Yttrium hydride",

author = "Hanns Gietl and Ben Garrison and Sprouster, {David J.} and Takaaki Koyanagi",

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PY - 2023/7

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Heterogeneous microstructure of yttrium hydride and its relation to mechanical properties

Abstract

Funding

Keywords

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