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Title: Small-angle neutron scattering measurements of deuteride formation in Nb

Abstract

Small-angle neutron-scattering (SANS) measurements of deuteride precipitation in pure Nb have been performed to investigate the effect of deformation, grain boundaries, and thermal history on the phase transformation temperature hysteresis. SANS is a very useful bulk probe of deuteride formation in metals for several reasons. First, the low interaction probability of thermal neutrons in matter results in low attenuation over several millimeters of sample thickness. This is opposed to transmission electron microscopy, which is limited to a few thousand angstroms and X-ray-based techniques that are limited to tens of microns. In addition, neutron-based techniques have superior sensitivity to hydrogen in metals. This is because the neutron-scattering lengths of the elements do vary systematically with atomic number. Thus, significant neutron-scattering contrast can exist between neighboring elements on the periodic table. Even more important with respect to hydrogen in metals is the fact that the scattering length of the deuteron is as large as that of any element. The formation of hydrogen-rich phases, or hydrides, is easily observed when deuterium is used in place of hydrogen. (The use of hydrogen is generally detrimental to the ability to resolve coherent scattering signals; the incoherent background is a factor of 40 larger and themore » coherent foreground a factor of 3 lower than that of deuterium.) SANS is an accurate probe of the early stages of deuteride formation because of this excellent sensitivity. Finally, the technique can yield particle morphological information, such as the shape, size, and orientation to host lattice (with the use of single crystal material).« less

Authors:
; ;  [1]
  1. Univ. of Illinois, Urbana, IL (United States)
Publication Date:
OSTI Identifier:
678123
Report Number(s):
CONF-990605-
Journal ID: TANSAO; ISSN 0003-018X; TRN: 99:009108
Resource Type:
Journal Article
Journal Name:
Transactions of the American Nuclear Society
Additional Journal Information:
Journal Volume: 80; Conference: 1999 annual meeting of the American Nuclear Society (ANS), Boston, MA (United States), 6-10 Jun 1999; Other Information: PBD: 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 66 PHYSICS; MICROSTRUCTURE; SMALL ANGLE SCATTERING; NEUTRONS; DEUTERIDES; PRECIPITATION; NIOBIUM; DEFORMATION; PHASE TRANSFORMATIONS; EXPERIMENTAL DATA

Citation Formats

Heuser, B.J., Chen, W., and Althauser, J.W. Small-angle neutron scattering measurements of deuteride formation in Nb. United States: N. p., 1999. Web.
Heuser, B.J., Chen, W., & Althauser, J.W. Small-angle neutron scattering measurements of deuteride formation in Nb. United States.
Heuser, B.J., Chen, W., and Althauser, J.W. Wed . "Small-angle neutron scattering measurements of deuteride formation in Nb". United States.
@article{osti_678123,
title = {Small-angle neutron scattering measurements of deuteride formation in Nb},
author = {Heuser, B.J. and Chen, W. and Althauser, J.W.},
abstractNote = {Small-angle neutron-scattering (SANS) measurements of deuteride precipitation in pure Nb have been performed to investigate the effect of deformation, grain boundaries, and thermal history on the phase transformation temperature hysteresis. SANS is a very useful bulk probe of deuteride formation in metals for several reasons. First, the low interaction probability of thermal neutrons in matter results in low attenuation over several millimeters of sample thickness. This is opposed to transmission electron microscopy, which is limited to a few thousand angstroms and X-ray-based techniques that are limited to tens of microns. In addition, neutron-based techniques have superior sensitivity to hydrogen in metals. This is because the neutron-scattering lengths of the elements do vary systematically with atomic number. Thus, significant neutron-scattering contrast can exist between neighboring elements on the periodic table. Even more important with respect to hydrogen in metals is the fact that the scattering length of the deuteron is as large as that of any element. The formation of hydrogen-rich phases, or hydrides, is easily observed when deuterium is used in place of hydrogen. (The use of hydrogen is generally detrimental to the ability to resolve coherent scattering signals; the incoherent background is a factor of 40 larger and the coherent foreground a factor of 3 lower than that of deuterium.) SANS is an accurate probe of the early stages of deuteride formation because of this excellent sensitivity. Finally, the technique can yield particle morphological information, such as the shape, size, and orientation to host lattice (with the use of single crystal material).},
doi = {},
journal = {Transactions of the American Nuclear Society},
number = ,
volume = 80,
place = {United States},
year = {1999},
month = {9}
}