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Channeling effects in X-ray microanalysis have been used to deduce the character of the point defects in the C14 and A15 eutectic phases of a quinternary Nb–Mo–Cr–Al–Si alloy. It is shown that these defects are predominantly antisite transition metal atoms in the C14 phase and constitutional vacancies in the A15 phase. Nanoindentation measurements show different mechanical responses upon heat-treatment...
Transmission electron microscopy has been used to study the precipitates that develop in the A2 phase of an Nb–Mo–Cr–Al–Si alloy upon heat treatment. The precipitates include a Laves-phase that adopts the cubic C15 structure initially and the hexagonal C14 structure in the later stages of precipitation. The morphologies, orientation relationships and defect microstructures indicate that the metastable...
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