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Small‐angle neutron scattering from pores produced in high‐temperature fatigue
Author(s) -
Saegusa T.,
Weertman J. R.,
Cohen J. B.,
Roth M.
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/s0021889878013977
Subject(s) - materials science , crystallite , neutron scattering , isotropy , anisotropy , scattering , small angle neutron scattering , copper , grain boundary , electron microscope , scanning electron microscope , composite material , condensed matter physics , crystallography , optics , metallurgy , microstructure , chemistry , physics
Polycrystalline specimens of copper have been fatigued in reverse bending, in a vacuum at 405°C at a maximum strain amplitude of 0.044%. A specimen tested to 0.07% of its expected life gives neutron scattering which is isotropic and identical to that of an unfatigued specimen, and which can be attributed to surface oxides. A specimen fatigued to 25% of its expected life gives a larger scattering, which is anisotropic. This is attributed to faceted pores at grain boundaries resulting from the high‐temperature fatigue. The quantitative results indicate the presence of pores smaller than those so far observed in the electron microscope.