Ni-based bulk amorphous alloys in the Ni–Ti–Zr–Si system

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We report on the fabrication and properties of the new Ni-based bulk amorphous alloys in the Ni–Ti–Zr–Si system that have high glass forming ability (GFA) and large undercooled region ( ΔT X), which corresponds to the temperature difference between glass transition temperature and the onset temperature of a first crystallization event. The compositional range for the formation of the amorphous alloys that have large ΔT X (>30 K) is defined in the pseudo-ternary phase diagram Ni–(Ti,Zr)–Si. Some alloys can be fabricated as fully amorphous rods 2 mm diameter through an injection casting method. Si effects on the crystallization behavior of these new Ni-based amorphous alloys are also investigated and related to the GFA and the ΔT X.