Strain ratchetting of titanium upon reversible alloying with hydrogen

M. Frary, C. Schuh, D. C. Dunand*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

During cyclic hydrogen charging (e.g., in metal–hydride systems), internal stresses and strains can be developed due to lattice swelling and/or phase transformation (e.g., allotropic transformation or hydride precipitation). We examine macroscopic plastic deformation due to such internal stresses (strain ratctetting) in the Ti–H system, where gaseous hydrogen is alloyed with Ti, causing the Ti α–β allotropic transformation, and subsequently removed, producing the β–α transformation. Cyclic hydrogen charging is found to cause macroscopic plastic shrinkage strains in directions normal to the hydrogen concentration gradient. Furthermore, increasing the charging time leads to larger ratchetting strains. A simple adaptation of diffusion theory is used to describe the kinetics of strain evolution, and the contributions to total ratchetting from both the α–β phase transformation and the lattice swelling strains are quantified.

Original languageEnglish (US)
Pages (from-to)197-212
Number of pages16
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume81
Issue number1
DOIs
StatePublished - Jan 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys

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