Dehydrogenation and Sintering of TiH2: An In Situ Study

Gang Chen; Klaus D. Liss; Graeme Auchterlonie; Huiping Tang; Peng Cao

doi:10.1007/s11661-017-4043-8

Dehydrogenation and Sintering of TiH₂: An In Situ Study

Gang Chen, Klaus D. Liss, Graeme Auchterlonie, Huiping Tang, Peng Cao^*

^*Corresponding author for this work

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

27 Scopus citations

Abstract

This first-ever study investigated dehydrogenation and microstructural evolution of TiH₂ during sintering under vacuum using in situ neutron diffraction, in situ transmission electron microscopy, and ex situ neutron tomography. The densification behavior, microstructure, hydrogen concentration, and in situ phase transformation were reported. The shrinkage, weight loss percentage, and densification of the TiH₂ powder compact monotonically increase with sintering temperature, while the open porosity behaves differently; porosity first increases at the initial sintering stage and then decreases during further sintering. The in situ phase transformation observations reveal that dehydrogenation starts from the outer area of either a particle or a powder compact and progressively carries forward into the interior of the particle or the compact. A shrinking core model was proposed to elucidate the dehydrogenation process for a single particle and a powder compact.

Original language	English
Pages (from-to)	2949-2959
Number of pages	11
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	48
Issue number	6
DOIs	https://doi.org/10.1007/s11661-017-4043-8
State	Published - 1 Jun 2017
Externally published	Yes

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title = "Dehydrogenation and Sintering of TiH2: An In Situ Study",

abstract = "This first-ever study investigated dehydrogenation and microstructural evolution of TiH2 during sintering under vacuum using in situ neutron diffraction, in situ transmission electron microscopy, and ex situ neutron tomography. The densification behavior, microstructure, hydrogen concentration, and in situ phase transformation were reported. The shrinkage, weight loss percentage, and densification of the TiH2 powder compact monotonically increase with sintering temperature, while the open porosity behaves differently; porosity first increases at the initial sintering stage and then decreases during further sintering. The in situ phase transformation observations reveal that dehydrogenation starts from the outer area of either a particle or a powder compact and progressively carries forward into the interior of the particle or the compact. A shrinking core model was proposed to elucidate the dehydrogenation process for a single particle and a powder compact.",

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AU - Cao, Peng

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AB - This first-ever study investigated dehydrogenation and microstructural evolution of TiH2 during sintering under vacuum using in situ neutron diffraction, in situ transmission electron microscopy, and ex situ neutron tomography. The densification behavior, microstructure, hydrogen concentration, and in situ phase transformation were reported. The shrinkage, weight loss percentage, and densification of the TiH2 powder compact monotonically increase with sintering temperature, while the open porosity behaves differently; porosity first increases at the initial sintering stage and then decreases during further sintering. The in situ phase transformation observations reveal that dehydrogenation starts from the outer area of either a particle or a powder compact and progressively carries forward into the interior of the particle or the compact. A shrinking core model was proposed to elucidate the dehydrogenation process for a single particle and a powder compact.

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Dehydrogenation and Sintering of TiH₂: An In Situ Study

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