Hydrogen isotope trapping in Al-Cu binary alloys [electronic resource].
- Washington, D.C. : United States. National Nuclear Security Administration, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- 34 pages : digital, PDF file
- Additional Creators:
- Sandia National Laboratories
United States. National Nuclear Security Administration
United States. Department of Energy. Office of Scientific and Technical Information
- 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<sup>–1</sup> (0.19 ± 0.03 eV). Typical occupancy of this trap is high; for Al–2.6 at. % Cu (a Cu composition comparable to that in AA2219) charged at 200 °C with 130 MPa D<sub>2</sub> for 68 days, there is ca. there is 3.15×10<sup>–7</sup> mol D bound to the precipitate trap per mol of Al, accounting for a third of the D in the charged sample.
- Published through SciTech Connect.
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing 658 C ISSN 0921-5093 AM
Paul Chao; Richard A. Karnesky.
- Funding Information:
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