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Title: Small-angle neutron scattering measurement of deuterium trapping at dislocations and grain boundaries in palladium

Abstract

Small angle neutron scattering measurements have been performed on deformed single and polycrystalline palladium with and without deuterium dissolved in the solution phase at room temperature. The purpose of these experiments was to directly measure the spatial distribution of trapped deuterium at dislocations in the deformed metal. The net scattering cross section for the same smaple with and without deuterium shows a behavior expected from deuterium correlation with dislocations froming rod-like scattering structures. The measured cross sections indicate the trapped deuterium is within 2 to 3 Burgers vectors of the dislocation core. On average 1 to 3 deuterons per {angstrom} are trapped at the dislocations in the deformed samples. The measurements also indicate the straight, rod-like correlation geometry extends on average 50 to 100 {angstrom} along the dislocations. Dislocation densities on the order of 5 {times} 10{sup 11} cm/cm{sup 3} were found for all samples investigated. Net scattering from a well annealed polycrystalline palladium sample exhibiting a behavior expected from spherical shells has been observed. This net scattering is attributed to deuterium trapping at grain boundaries in the polycrystalline sample. net scattering in excess of that expected from deuterium correlated at dislocations was also observed in a deformed polycrystalline measurement.more » This too is attributed to deuterium trapping at grain boundaries. The dislocation substructure of the deformed palladium samples was characterized by transmission electron microscopy (TEM). This analysis illustrated the cellular arrangement that evolved in palladium during cold working. The presence of MnO particles also was confirmed by TEM analysis.« less

Authors:
Publication Date:
Research Org.:
Michigan Univ., Ann Arbor, MI (United States)
OSTI Identifier:
5902107
Alternate Identifier(s):
OSTI ID: 5902107
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph.D)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DEUTERIUM; SPATIAL DISTRIBUTION; PALLADIUM; SMALL ANGLE SCATTERING; AMBIENT TEMPERATURE; COLD WORKING; CROSS SECTIONS; CRYSTAL STRUCTURE; DISLOCATIONS; GRAIN BOUNDARIES; MANGANESE OXIDES; POLYCRYSTALS; TRANSMISSION ELECTRON MICROSCOPY; CHALCOGENIDES; CRYSTAL DEFECTS; CRYSTALS; DISTRIBUTION; ELECTRON MICROSCOPY; ELEMENTS; FABRICATION; HYDROGEN ISOTOPES; ISOTOPES; LIGHT NUCLEI; LINE DEFECTS; MANGANESE COMPOUNDS; MATERIALS WORKING; METALS; MICROSCOPY; MICROSTRUCTURE; NUCLEI; ODD-ODD NUCLEI; OXIDES; OXYGEN COMPOUNDS; PLATINUM METALS; SCATTERING; STABLE ISOTOPES; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS 360106* -- Metals & Alloys-- Radiation Effects; 360102 -- Metals & Alloys-- Structure & Phase Studies

Citation Formats

Heuser, B.J.. Small-angle neutron scattering measurement of deuterium trapping at dislocations and grain boundaries in palladium. United States: N. p., 1991. Web.
Heuser, B.J.. Small-angle neutron scattering measurement of deuterium trapping at dislocations and grain boundaries in palladium. United States.
Heuser, B.J.. Tue . "Small-angle neutron scattering measurement of deuterium trapping at dislocations and grain boundaries in palladium". United States.
@article{osti_5902107,
title = {Small-angle neutron scattering measurement of deuterium trapping at dislocations and grain boundaries in palladium},
author = {Heuser, B.J.},
abstractNote = {Small angle neutron scattering measurements have been performed on deformed single and polycrystalline palladium with and without deuterium dissolved in the solution phase at room temperature. The purpose of these experiments was to directly measure the spatial distribution of trapped deuterium at dislocations in the deformed metal. The net scattering cross section for the same smaple with and without deuterium shows a behavior expected from deuterium correlation with dislocations froming rod-like scattering structures. The measured cross sections indicate the trapped deuterium is within 2 to 3 Burgers vectors of the dislocation core. On average 1 to 3 deuterons per {angstrom} are trapped at the dislocations in the deformed samples. The measurements also indicate the straight, rod-like correlation geometry extends on average 50 to 100 {angstrom} along the dislocations. Dislocation densities on the order of 5 {times} 10{sup 11} cm/cm{sup 3} were found for all samples investigated. Net scattering from a well annealed polycrystalline palladium sample exhibiting a behavior expected from spherical shells has been observed. This net scattering is attributed to deuterium trapping at grain boundaries in the polycrystalline sample. net scattering in excess of that expected from deuterium correlated at dislocations was also observed in a deformed polycrystalline measurement. This too is attributed to deuterium trapping at grain boundaries. The dislocation substructure of the deformed palladium samples was characterized by transmission electron microscopy (TEM). This analysis illustrated the cellular arrangement that evolved in palladium during cold working. The presence of MnO particles also was confirmed by TEM analysis.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

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