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Small‐angle X‐ray scattering studies of voids in neutron‐irradiated molybdenum
Author(s) -
Liu S.,
Moteff J.,
Hendricks R. W.,
Lin J. S.
Publication year - 1978
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889878013928
Subject(s) - small angle x ray scattering , materials science , irradiation , void (composites) , scattering , neutron , fluence , transmission electron microscopy , small angle neutron scattering , dislocation , small angle scattering , crystallography , molybdenum , neutron scattering , x ray , analytical chemistry (journal) , optics , composite material , chemistry , nuclear physics , physics , nanotechnology , metallurgy , chromatography
Small disks of molybdenum were irradiated in the Oak Ridge Research Reactor to a fast‐neutron fluence of about 1 × 10 21 neutrons cm −2 , at temperatures between 220 and 900°C. The defect structure in the neutron‐irradiated specimens as determined by transmission electron microscopy (TEM) consisted of both dislocation loops and small voids at the lower irradiation temperatures, while essentially only voids were observed at the higher irradiation temperatures. Small‐angle X‐ray scattering (SAXS) measurements were made with the ORNL 10m small‐angle X‐ray camera using Mo Kα radiation. Satisfactory agreement between the TEM and SAXS results for the void sizes and degree of swelling has been obtained in those samples containing essentially only voids. However, for samples containing both small voids and dislocation loops, the values of both void sizes and the degree of swelling as determined by SAXS were consistently larger than those obtained by TEM. It is believed that the presence of the small irradiation‐induced loops contributes a significant fraction of the X‐ray scattering.