期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.02.003
关键词
Age-hardening; Aluminum alloys; Hydrogen embrittlement; Al-Cu; Hydrogen diffusion and trapping; Hydrogen desorption
类别
资金
- Sandia National Laboratories Laboratory Directed Research and Development (LDRD) Program [165724]
- US Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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 degrees C with 130 MPa D-2 for 68 days, there is ca. there is 3.15 x 10(-7) mol D bound to the precipitate trap per mol of Al, accounting for a third of the D in the charged sample. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据