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- W2024586071 abstract "The η’-precipitate is the main strengthening agent in age-hardening Al-Mg-Zn alloys. A new structure model of the phase has been derived by a combination of electron microscopy techniques and synchrotron X-ray diffraction. Samples for intensity measurements were prepared from an alloy casting with large matrix grains alloyed with 88.1 Al, 10.2 Zn, and 1.68 Mg. wt per cent, after aging by a standard procedure. Electron microscope images reveal a distribution of precipitates 3-10 nm wide, with varying degree of stacking disorder, in four different lattice orientations, embedded in the aluminiummatrix. Electron diffraction patterns confirmed the hexagonal lattice, a = 0.496 nm, c = 1.405 nm reported earlier. Intensities were measured by the precession technique [1], which suppressed multiple scattering viamatrix reflections, but incurred a high background of diffuse scattering. Systematic absences are consistent with three hexagonal, P63mc (186), P62c (190) and P63/mmc (194) or two trigonal space groups, P31c (159) and P31c (163). Due to the extensive overlap and high background level, we could not distinguish between amodified version in (190) of the earlier model [2] or a trigonal structure in (163) from electron diffraction data. Three-dimensional synchrotron data were collected at the Swiss Norwegian Beamlines at ESRF from two single aluminium grains. More than 2000 intensities were extracted from each of the four orientations of these precipitate. The preliminary analysis points towards an average structure best described in the centrosymmetric space group P31c. A trigonal model adopted for an average η’-structure can be described as a faulted stacking of units of the Laves phase stable MgZn2, in a way that retains the trigonal stacking as in the parent FCC aluminium lattice." @default.
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- W2024586071 date "2006-08-06" @default.
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- W2024586071 title "Structure determination of nanosized, semi-coherent Al-Mg-Zn precipitates by precession electron diffraction and synchrotron X-ray diffraction" @default.
- W2024586071 doi "https://doi.org/10.1107/s0108767306098965" @default.
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