Effect of dislocation trapping on deuterium diffusion in deformed, single-crystal Pd

Brent J. Heuser, John S. King

Research output: Contribution to journalArticlepeer-review

Abstract

Small-angle neutron scattering (SANS) has been used to characterize deuterium trapping at dislocations in deformed, single-crystal Pd during in situ gas evolution experiments. Two methods of deformation were employed-cold rolling and hydride cycling-which create different dislocation arrangements or substructures in Pd. The reduction of the trapped deuterium concentration at dislocations during evolution was directly monitored with SANS. Exponential decay rates of the trapped concentration were observed for both sample types, as is expected in a bulk diffusion process modified by the dislocation trapping interaction. The deuterium concentration reduction proceeded 1.2 to 1.4 times faster in the cold-rolled sample material than in the cycled material. This is attributed to the presence of a smaller number of dislocation trapping sites in the cold-rolled material. The binding energy of deuterium at dislocations was determined by applying a diffusion-based model. A binding energy of 0.20 eV was found to characterize the trapping interaction in both cold-rolled and hydridecycled Pd.

Original languageEnglish (US)
Pages (from-to)1593-1598
Number of pages6
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume29
Issue number6
DOIs
StatePublished - 1998

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Fingerprint

Dive into the research topics of 'Effect of dislocation trapping on deuterium diffusion in deformed, single-crystal Pd'. Together they form a unique fingerprint.

Cite this