Absorption and desorption of hydrogen in Fe-40Al intermetallic

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Cited by (17)

  • Hydrogen absorption and embrittlement of ultra-high strength aluminized press hardening steel

    2018, Materials Science and Engineering: A
    Citation Excerpt :

    However, temperature-dependence of the H behavior in Fe-Al or Fe-Al-Si intermetallics is not known and thus, further investigation will be needed to fully understand the role of the intermetallics in the H absorption and desorption of Al-Si coated PHS. Fig. 11(c) shows the literature data of the H diffusivity in Fe-Al alloys at room temperature, indicating that the H diffusion is generally slower in Fe-Al alloys than in pure Fe or lath martensitic steel [25,26,29–35]. This suggests that the reacted coating layer of the Al-Si coated PHS, consisting mainly of the Fe-Al intermetallics, likely lowers the permeability of H through the surface of the alloy, preventing H from diffusing out of the martensite.

  • Cr effect on hydrogen embrittlement of Fe<inf>3</inf>Al-based iron aluminide intermetallics: Surface or bulk effect

    2014, Acta Materialia
    Citation Excerpt :

    Density functional theory–local density approximation calculations [11] in addition to periodic density functional theory calculations within the generalized gradient approximation [12] predicted that hydrogen sits at tetrahedral sites in the bulk FeAl lattice, like its interstitial sites in bulk Fe [13]. Hydrogen diffusivity in iron aluminides is lower than in pure Fe [14–16]; and the activation barrier varies from 0.42 eV [14], 0.22 eV [17] and 0.26 eV [12] for Fe25Al, Fe40Al and Fe50Al, respectively. Electrochemical permeation tests [18–20] found that H diffusivity in Fe–Al alloys decreases with increasing Al content.

  • Studies on hydrogen diffusivity in iron aluminides using the Devanathan-Stachurski method

    2014, Journal of Physics and Chemistry of Solids
    Citation Excerpt :

    The value of DH = 1.6 × 10−5 cm2/s obtained by Chiu et al. using the time-lag technique [27] seems to be the most reliable. Data on hydrogen diffusivity in FeAl-type aluminides are very scarce in the literature [13,28,29]. A trend similar to that for Fe3Al alloys is observed, whereby DH decreases with increasing aluminium content.

  • Effect of hydrogen on room-temperature plasticity of B2 iron aluminides

    2011, Corrosion Science
    Citation Excerpt :

    As these boundaries are intrinsically weak (due to the ordering of the intermetallic’s structure) the plasticity after hydrogen charging of Fe50Al alloy does not change in a significant way. This hypothesis seems to be confirmed also by the results of paper [21], where it has been found that the grain boundaries in the FeAl alloy act as hydrogen condensation sites and hydrogen in grain boundaries possesses higher stability than in the vacancy. Another reason of comparable plasticity of Fe50Al alloy in the annealed state and after hydrogen charging may be such, that hydrogen trapped by vacancies reduces the elastic strain field which is generated by vacancies – as suggested in paper [12] and therefore its presence does not result in additional decreasing of the plasticity.

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