Crystallization of bulk amorphous Zr-Ti(Nb)-Cu-Ni-Al

Small-angle neutron scattering (SANS) and transmission electron microscopy were used to resolve the crystallization of the bulk amorphous alloys Zr52. 5Ti5Cu17.9Ni14.6Al10 (Vit105) and Zr57Nb5Cu15.4Ni12.6Al10 (Vit106). Decompo sition and nanocrystallization were observed in both alloy compositions in the temperature regime from the glass transition, T-g, up to at least 90 K above T-g. From in situ SANS measurements on Vit105, chemical diffusion dat a were obtained whose temperature dependence follows an Arrhenius law. Norm alizing the temperature to T-g, the diffusion data of Vit105 are very simil ar to those of the well-investigated bulk amorphous alloy Zr41.2Ti13.8Cu12. 5Ni10Be22.5. (C) 2000 American Institute of Physics. [S0003- 6951(00)04930- 5].