Crystallization behavior of Zr52Cu18Ni15Al10Ti5 bulk glass with quenched-in crystals

Zr52Cu18Ni15Al10Ti5 bulk glass samples with a diameter of 8 mm prepared by copper mold with water-cooling have a mixing structure of amorphous phase and quenched-in crystals. By isothermal annealing at different temperatures, the crystallization process of the glass alloy is shown to be a multi-staged crystallization reaction as follows: Am+quenched-in crystals&rarrAm'+cellular phase+(Zr, Ti)-Al&rarrAm'+cellular phase+(Zr, Ti)-Al+(Zr, Ti)2(Cu, Ni). Morphology of the quenched-in crystals changes from dot or dendritic phase in the as-cast bulk glass to cellular phase at different annealing states. The residual region surrounded by the cellular phase has a mixing structure of nano-scale phase and amorphous phase.