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Rapidly solidified Ni-Al intermetallic ribbons were produced by chill-block melt spinning in the composition range 68-90 at.% Ni with and without small additions of boron (200, 2000, 4000 wt.ppm). The microstructures of the ribbons were investigated by X-ray diffraction and transmission electron microscopy. The results can be explained based on Norbaskhsh and Chen's metastable phase diagram, in...