MOSSBAUER-EFFECT STUDIES OF AMORPHOUS AL-Y-NI-FE ALLOYS

Amorphous Al-Y-Ni alloys, prepared by rapid solidification from the me lt, have shown a unique combination of low density and high tensile st rength. In the present work amorphous alloys of the composition Al87Y8 Ni5-xFex (2 less-than-or-equal-to x less-than-or-equal-to 5) have been studied using room temperature Fe-57 Mossbauer effect spectroscopy. T hese alloys show a mean quadrupole splitting which increases slightly with increasing Fe content. The mean isomer shift remains essentially constant as a function of x. All spectra are very nearly symmetric, in dicating a weak correlation between the isomer shift and quadrupole sp litting. The mean isomer shift is approximately +0.17 mm/s relative to alpha-Fe and is consistent with Fe probe atoms in a close-packed Al e nvironment.