Abstract

The phase transformation reactions that occur in Al 85 Ni 10 La 5 alloy during mechanical milling were studied by using fully and partially amorphous ribbons (comprised of fcc-Al, Al 3 Ni, Al 11 La 3 and amorphous phases) as starting materials. X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) study showed that the Al 3 Ni phase crystallized, whereas the Al 11 La 3 phase amorphized during mechanical milling. The results reported herein indicated that, irrespective of the phase constitution of the starting materials, the microstructure that evolved following mechanical milling was comprised of the same phases; namely: fcc-Al, Al 3 Ni and amorphous phases. Differential scanning calorimetry (DSC) analysis revealed that the difference in the structural stability of the Al 3 Ni and Al 11 La 3 phases are related to the chemical short-range order of the solute atoms in the amorphous phase. The results described in this paper provide an alternative approach to study glass forming ability during mechanical milling.

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