Microstructural details of hydrogen diffusion and storage in Ti–V–Cr alloys activated through surface and bulk severe plastic deformation

Marc Novelli, K. Edalati, S. Itano, Hai Wen Li, E. Akiba, Z. Horita, Thierry Grosdidier

Research output: Contribution to journalArticle

Abstract

Structural observations were carried out on particles obtained after hydrogenation cycling of the Ti25V50Cr25 and Ti10V75Cr15 alloys processed by surface or bulk severe plastic deformation using the surface mechanical attrition treatment (SMAT) and high-pressure torsion (HPT) techniques, respectively. The produced particles differ in morphologies and fracture mode due to the differences in hydrogen diffusion paths. The fracture mode for the SMAT-processed samples with the gradient microstructure was mainly intragranular, whereas it was intergranular for the nanograined HPT processed samples. Hydrogen diffusion, which initiated at the grain boundaries on the surface, created Ti-rich and V-lean areas. The powders contained mainly β-VH monohydride and partly γ-VH2 dihydride, and an orientation relationship of (100)β//(110)γ and [001]β//[001]γ with an angular deviation of ∼2.5° was observed between the two phases using the electron backscattered diffraction (EBSD) analysis.

Original languageEnglish
JournalInternational Journal of Hydrogen Energy
DOIs
Publication statusPublished - Jan 1 2019

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plastic deformation
Plastic deformation
Hydrogen
comminution
hydrogen
Torsional stress
torsion
dihydrides
Electron diffraction
Hydrogenation
hydrogenation
Grain boundaries
electron diffraction
grain boundaries
deviation
Powders
gradients
microstructure
Microstructure
cycles

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Microstructural details of hydrogen diffusion and storage in Ti–V–Cr alloys activated through surface and bulk severe plastic deformation. / Novelli, Marc; Edalati, K.; Itano, S.; Li, Hai Wen; Akiba, E.; Horita, Z.; Grosdidier, Thierry.

In: International Journal of Hydrogen Energy, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Akiba, E.

AU - Horita, Z.

AU - Grosdidier, Thierry

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AB - Structural observations were carried out on particles obtained after hydrogenation cycling of the Ti25V50Cr25 and Ti10V75Cr15 alloys processed by surface or bulk severe plastic deformation using the surface mechanical attrition treatment (SMAT) and high-pressure torsion (HPT) techniques, respectively. The produced particles differ in morphologies and fracture mode due to the differences in hydrogen diffusion paths. The fracture mode for the SMAT-processed samples with the gradient microstructure was mainly intragranular, whereas it was intergranular for the nanograined HPT processed samples. Hydrogen diffusion, which initiated at the grain boundaries on the surface, created Ti-rich and V-lean areas. The powders contained mainly β-VH monohydride and partly γ-VH2 dihydride, and an orientation relationship of (100)β//(110)γ and [001]β//[001]γ with an angular deviation of ∼2.5° was observed between the two phases using the electron backscattered diffraction (EBSD) analysis.

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