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Dehydrogenation and Sintering of TiH2: An In Situ Study

Journal Article


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.

Publication Date


  • 2017

Citation


  • Chen, G., Liss, K. D., Auchterlonie, G., Tang, H., & Cao, P. (2017). Dehydrogenation and Sintering of TiH2: An In Situ Study. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 48(6), 2949-2959. doi:10.1007/s11661-017-4043-8

Scopus Eid


  • 2-s2.0-85015644228

Start Page


  • 2949

End Page


  • 2959

Volume


  • 48

Issue


  • 6

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.

Publication Date


  • 2017

Citation


  • Chen, G., Liss, K. D., Auchterlonie, G., Tang, H., & Cao, P. (2017). Dehydrogenation and Sintering of TiH2: An In Situ Study. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 48(6), 2949-2959. doi:10.1007/s11661-017-4043-8

Scopus Eid


  • 2-s2.0-85015644228

Start Page


  • 2949

End Page


  • 2959

Volume


  • 48

Issue


  • 6