Hydrogen isotope trapping in Al-Cu binary alloys

Chao, Paul; Karnesky, Richard A.

doi:10.1016/j.msea.2016.02.003

Title: Hydrogen isotope trapping in Al-Cu binary alloys

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Abstract

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 is high; for Al–2.6 at. % Cu (a Cu composition comparable to that in AA2219) charged at 200 °C with 130 MPa D₂ 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.

Authors:

Chao, Paul ^[1]; Karnesky, Richard A. ^[2]

Sandia National Lab. (SNL-CA), Livermore, CA (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Publication Date:: Fri Jan 01 00:00:00 EST 2016

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1240091

Alternate Identifier(s):: OSTI ID: 1360849

Report Number(s):: SAND2016-0133J
Journal ID: ISSN 0921-5093; 617645

Grant/Contract Number:: AC04-94AL85000; 165724

Resource Type:: Accepted Manuscript

Journal Name:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

Additional Journal Information:: Journal Volume: 658; Journal Issue: C; Journal ID: ISSN 0921-5093

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Chao, Paul, and Karnesky, Richard A. Hydrogen isotope trapping in Al-Cu binary alloys.  United States: N. p., 2016. 
Web.  doi:10.1016/j.msea.2016.02.003.

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                    Chao, Paul, & Karnesky, Richard A. Hydrogen isotope trapping in Al-Cu binary alloys.  United States.  https://doi.org/10.1016/j.msea.2016.02.003

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                    Chao, Paul, and Karnesky, Richard A. Fri .  
"Hydrogen isotope trapping in Al-Cu binary alloys".  United States.  https://doi.org/10.1016/j.msea.2016.02.003.  https://www.osti.gov/servlets/purl/1240091.

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@article{osti_1240091,

  title        = {Hydrogen isotope trapping in Al-Cu binary alloys},

  author       = {Chao, Paul and Karnesky, Richard A.},

  abstractNote = {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 is high; for Al–2.6 at. % Cu (a Cu composition comparable to that in AA2219) charged at 200 °C with 130 MPa D2 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.},

  doi          = {10.1016/j.msea.2016.02.003},

  journal      = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},

  number       = C,

  volume       = 658,

  place        = {United States},

  year         = {Fri Jan 01 00:00:00 EST 2016},

  month        = {Fri Jan 01 00:00:00 EST 2016}

}

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