Abstract
Melt-spun Al alloys containing 2.7–10 at.% La were studied by means of x-raydiffraction, transmission electron microscopy, electrical resistivity, thermal andmicrohardness measurements. Fully amorphous structures were only obtained forthin AlLa7.7 and AlLa10 ribbons and exhibit concentration fluctuations. Phaseseparation into two metastable bcc structures is observed; they appearsuccessively and are finally replaced by the equilibrium phases α(fcc)Al and (orthorhombic)Al11La3. The transformation kinetics is analysed interms of a general Johnson–Mehl–Avrami–Kolmogorov model and of local kineticparameters. The Avrami exponent monitors changes in the crystallizationbehaviour; nucleation of the stable phases occurs after partial dissolution of themetastable phases. The low values of the activation energy reflect the highinstability of these glasses.
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