Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Small-angle neutron scattering experiments were performed on the bulk amorphous alloy Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vit1®, subscripts indicate at.%) and on other alloys, where the (Zr,Ti) and (Cu,Be) contents were varied by following the line in composition space connecting Vit1 and Zr46.8Ti8.2Cu7.5Ni10Be27.5 (Vit4®). The small-angle neutron scattering data of the samples, annealed at temperatures between 603 K and 663 K, show interference peaks, giving evidence for spatially correlated arrangements of inhomogeneities. The Q values of the interference peaks, Qmax, decrease with increasing annealing temperature Ta and, at a given annealing temperature, with composition following the connecting line from Vit1 to Vit4. Down to the glass transition temperature Tg, the data follow a relation 1/L2 ∝ (Ts − Ta) as predicted by the linearized Cahn theory, with L = 2π/Qmax the characteristic wavelength of the decomposition and Ts the apparent spinodal temperature. Below Tg, a different behavior is observed, which may be either due to a change in atomic diffusion or due to an insufficient relaxation of the samples.
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