Magnetic scattering in the simultaneous measurement of small-angle neutron scattering and Bragg edge transmission from steel

Yojiro Oba, Satoshi Morooka, Kazuki Ohishi, Nobuhiro Sato, Rintaro Inoue, Nozomu Adachi, Jun Ichi Suzuki, Toshihiro Tsuchiyama, Elliot Paul Gilbert, Masaaki Sugiyama

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    Pulsed neutron sources enable the simultaneous measurement of small-angle neutron scattering (SANS) and Bragg edge transmission. This simultaneous measurement is useful for microstructural characterization in steel. Since most steels are ferromagnetic, magnetic scattering contributions should be considered in both SANS and Bragg edge transmission analyses. An expression for the magnetic scattering contribution to Bragg edge transmission analysis has been derived. The analysis using this expression was applied to Cu steel. The ferrite crystallite size estimated from this Bragg edge transmission analysis with the magnetic scattering contribution was larger than that estimated using conventional expressions. This result indicates that magnetic scattering has to be taken into account for quantitative Bragg edge transmission analysis. In the SANS analysis, the ratio of magnetic to nuclear scattering contributions revealed that the precipitates consist of body-centered cubic Cu0.7Fe0.3 and pure Cu, which probably has 9R structure including elastic strain and vacancies. These results show that effective use of the magnetic scattering contribution allows detailed analyses of steel microstructure.A technique for the analysis of magnetic scattering has been developed, where small-angle neutron scattering and Bragg edge transmission measurements are performed simultaneously. This technique is shown to provide crystallographic information for ferrite crystallites and nanostructural information for precipitates in steel.

    Original languageEnglish
    Pages (from-to)1659-1664
    Number of pages6
    JournalJournal of Applied Crystallography
    Volume49
    Issue number5
    DOIs
    Publication statusPublished - Oct 1 2016

    All Science Journal Classification (ASJC) codes

    • Biochemistry, Genetics and Molecular Biology(all)

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