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Title: Hydrogen Isotope Trapping in Al-Cu Binary Alloys and AA2219.

Abstract

Abstract not provided.

Authors:
;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1390466
Report Number(s):
SAND2016-8769C
647195
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the International Hydrogen Conference held September 11-16, 2016 in Moran, WY.
Country of Publication:
United States
Language:
English

Citation Formats

Karnesky, Richard A., and Chao, Paul. Hydrogen Isotope Trapping in Al-Cu Binary Alloys and AA2219.. United States: N. p., 2016. Web.
Karnesky, Richard A., & Chao, Paul. Hydrogen Isotope Trapping in Al-Cu Binary Alloys and AA2219.. United States.
Karnesky, Richard A., and Chao, Paul. 2016. "Hydrogen Isotope Trapping in Al-Cu Binary Alloys and AA2219.". United States. doi:. https://www.osti.gov/servlets/purl/1390466.
@article{osti_1390466,
title = {Hydrogen Isotope Trapping in Al-Cu Binary Alloys and AA2219.},
author = {Karnesky, Richard A. and Chao, Paul},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9
}

Conference:
Other availability
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  • Abstract not provided.
  • In this study, the trapping mechanisms for hydrogen isotopes in Al–X Cu (0.0 at. % < X < 3.5 at. %) alloys were investigated using thermal desorption spectroscopy (TDS), electrical conductivity, and differential scanning calorimetry. Constant heating rate TDS was used to determine microstructural trap energies and occupancies. In addition to the trapping states in pure Al reported in the literature (interstitial lattice sites, dislocations, and vacancies), a trap site due to Al–Cu intermetallic precipitates is observed. The binding energy of this precipitate trap is (18 ± 3) kJ•mol –1 (0.19 ± 0.03 eV). Typical occupancy of this trap ismore » high; for Al–2.6 at. % Cu (a Cu composition comparable to that in AA2219) charged at 200 °C with 130 MPa D 2 for 68 days, there is ca. there is 3.15×10 –7 mol D bound to the precipitate trap per mol of Al, accounting for a third of the D in the charged sample.« less
  • A rotatable collector probe was used to expose several graphite samples to a deuterium-to-hydrogen-to-deuterium exchange experiment in the Tokamak Fusion Test Reactor (TFTR) at the start of the 1988 operations period. This experiment proved the utility of helium conditioning discharges in accelerating the changeover process. Samples included portions of a tile taken from the inner bumper limiter (POCO AXF-5Q graphite) of TFTR during the recent machine opening, and coupons which had been conditioned in the Plasma Interactive Surface Component Experimental Station (PISCES) by exposure to a helium plasma. The samples were exposed to different groups of the {approximately}100 1.4 MAmore » discharges that comprised the experiment. They were removed and analyzed for retained deuterium and impurities by nuclear reaction analysis and Rutherford backscattering spectrometry. Codeposited carbon layers had been formed with thicknesses up to several tenths of a micron. The inferred percentages of trapped hydrogenic species were in general agreement with spectroscopic data. The computed carbon fluence per D{sup +} discharge, 1.2 {times} 10{sup 17}C/cm{sup 2}, is compared to recent measurements on limiter tiles removed from TFTR. 22 refs., 3 figs., 1 tab.« less
  • A rotatable collector probe was used to expose several graphite samples to a deuterium-to-hydrogen-to-deuterium exchange experiment in the Tokamak Fusion Test Reactor (TFTR) at the start of the 1988 operations period. This experiment proved the utility of helium conditioning discharges in accelerating the changeover process. Samples included portions of a tile taken from the inner bumper limiter (POCO AXF-5Q graphite) of TFTR during the recent machine opening, and coupons which had been conditioned in the Plasma Surface Interaction Experimental Facility (PISCES) by exposure to a helium plasma. The samples were exposed to different groups of the /approximately/100 1.4MA discharges thatmore » comprised the experiment. They were removed and analyzed for retained deuterium and impurities by nuclear reaction analysis and Rutherford backscattering spectrometry. Codeposited carbon layers had been formed with thicknesses up to several tenths of a micron. The inferred percentages of trapped hydrogenic species were in general agreement with spectroscopic data. The computed carbon fluence per D discharge, 1.2 /times/ 10 X C/cmS, is compared to recent measurements on limiter tiles removed from TFTR. 21 refs., 3 figs., 1 tab.« less