Abstract
Atomic structures of amorphousAl89La6Ni5,prepared by single-roller melt spinning, and pre-annealed at 493 and 588 K for 1 h, were characterizedby differential scanning calorimetry, x-ray diffraction with a large wavevector transfer value, LaL3-edgeand Ni K-edge x-ray absorption fine structure and the reverse Monte Carlo technique. Inthe as-prepared amorphous alloy, our study reveals that the Ni–Al distance is2.38 ± 0.02 Åcoupled with a coordination number as low as 6.2. The Al–Al distance was found to be∼4.5% shorter than the nominal atomic diameter of aluminium and the coordination number to be∼39% less than expected from the dense random packing model. Crystallization of theAl89La6Ni5 glassy alloy at high temperatures can be described as follows: [amorphous alloy] [fcc-Al] + [bcc-(AlLa)] + residual amorphous [fcc-Al] + [o-Al3Ni ] + [o-La3Al11 ].
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