Physical and Thermomechanical Properties of Yttrium Hydride from Large Scale Bulk Metal Hydriding Furnace Article Swipe
Xunxiang Hu
,
Danny Schappel
,
Artem A. Trofimov
,
Hsin Wang
,
Ying Yang
,
Chinthaka M. Silva
,
M. Balooch
,
Kurt A. Terrani
·
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.2172/1866716
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.2172/1866716
Given the superior thermal stability and highly attainable hydrogen density, yttrium hydride is an excellent high-temperature moderator material in advanced thermal neutron spectrum reactors that require small core volumes. Yttrium hydride has been selected as the moderator material for the Transformational Challenge Reactor, which was launched at Oak Ridge National Laboratory (ORNL) in 2019. However, fabrication of large-scale crack-free yttrium hydride is challenging and very limited efforts have been committed to the characterization of bulk yttrium hydride in response to the need to establish a complete database of the thermomechanical properties of YHx. In this report, the challenges associated with fabricating large-scale crack-free yttrium hydride are discussed herein. In response to those challenges, a hydriding system was designed and constructed at ORNL and was used to successfully fabricate crack-free yttrium hydride in complex geometries at large scales. This was accomplished by precisely controlling the hydrogen’s partial pressure and the retort temperature, which was informed by the well-established thermodynamic properties of the binary H-Y system. Hydrogen content in as-fabricated hydride was determined by the weight change method and vacuum hot extraction technique, complemented by the X-ray diffraction (XRD). In addition, significant efforts are being dedicated to establishing a complete database of the thermomechanical properties of as-fabricated yttrium hydride. In FY2020, we investigated the thermophysical properties of yttrium hydrides as a function of temperature (room temperature to 700°C) and hydrogen concentration (H/Y ratio ranges from 1.52 to 1.93). The results indicate that at the temperatures below 300 °C, the hydrogen content did not have a significant influence on the thermal expansion, while the specific heat capacity, the thermal diffusivity, and the calculated thermal conductivity were slightly higher for the higher H/Y ratio. Between 300°C and 700 °C, a reversible second-order endothermic transition in all measured thermal properties was observed. It was also found that the onset temperatures of the observed transition varied, with the composition having inverse dependence on the hydrogen content. An attempt was made to explain the behavior of the thermophysical properties at higher temperatures by considering the order– disorder transition as a result of hydrogen redistribution. In addition, nanoindentation was employed to determine the elastic modulus and hardness and to capture the crystal orientation dependence of these parameters. Vickers hardness was also reported. The final section of the report introduces ongoing neutron irradiation campaign of yttrium hydride.
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- Type
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- Language
- en
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- OA Status
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- Cited By
- 1
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- Related Works
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- OpenAlex ID
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All OpenAlex metadata
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https://openalex.org/W4285655886Canonical identifier for this work in OpenAlex
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https://doi.org/10.2172/1866716Digital Object Identifier
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Physical and Thermomechanical Properties of Yttrium Hydride from Large Scale Bulk Metal Hydriding FurnaceWork title
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reportOpenAlex work type
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enPrimary language
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2020Year of publication
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2020-09-01Full publication date if available
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Xunxiang Hu, Danny Schappel, Artem A. Trofimov, Hsin Wang, Ying Yang, Chinthaka M. Silva, M. Balooch, Kurt A. TerraniList of authors in order
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https://doi.org/10.2172/1866716Publisher landing page
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YesWhether a free full text is available
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greenOpen access status per OpenAlex
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https://www.osti.gov/biblio/1866716Direct OA link when available
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Yttrium, Hydride, Hydrogen, Materials science, Metal, Thermal, Metallurgy, Thermodynamics, Chemistry, Physics, Oxide, Organic chemistryTop concepts (fields/topics) attached by OpenAlex
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1Total citation count in OpenAlex
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