Abstract
Abstract X-ray spectra and Z-contrast images have been obtained from thin foils of off-stoichiometric Ni3Al both with and without boron. The results show that grain boundaries in nickel-rich Ni3Al are nickel-enriched and that the addition of boron increases this nickel enrichment. The nickel enrichment is present as a second phase along some boundaries in undoped material and along all boundaries in boron-doped material. The phase is shown, using convergent-beam electron diffraction, to be disordered and to have the same orientation as one of the adjacent grains. By comparison, grain boundaries in aluminium-rich Ni3Al, either with or without boron, have compositions that are similar to the matrix. Correspondingly, a second phase was not found along the grain boundaries of this alloy.
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