Lattice dynamics of hydrogenated austenitic steels
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Date
2005-01-31
Journal Title
Journal ISSN
Volume Title
Publisher
Australian Institute of Physics
Abstract
We investigated hydrogen vibrations in of Fe 18Cr-10Ni and Fe-25Cr-20Ni austenitic steels doped in H gas atmosphere at pressures up to 7 GPa. Measurements were performed with neutron spectrometers FANS at NIST and TOSCA at ISIS. Experiments show that vibrational energy of H atoms in studied steels decreases from 132 meV at H/Me=0.0033 to 111 meV at H/Me=0.9 due to lattice dilatation. The hydrogen peaks are broadened. At H contents from 0.003 to 0.4-where the single broad peak is observed-the broadening is most probably connected with the Me-H force constant disorder. At H/Me>0.4-0.5-where H-peak has the two-component structure-the H-H interaction becomes important resulting in the dispersion of the optical phonon branches.
Description
Keywords
Alloys, Carbon additions, Coherent scattering, Diffraction, Elements, Energy range, Iron alloys, Iron base alloys, Materials, Measuring instruments, Nonmetals, Pressure range, Quasi particles, Spectrometers, Steels, Transition element alloys
Citation
Danilkin, S. A., Hoelzel, M., Udovic, T. J., Rameriz-Cuesta, T., Parker, S., Wipf, H., & Fuess, H. (2005). Lattice dynamics of hydrogenated austenitic steels. Paper presented to the 29th Condensed Matter and Materials Meeting, "Australian Institute of Physics Sixteenth Biennial Congress", Canberra, 2005, 31 January - 4 February 2005.