New Ni-based bulk amorphous alloys in the alloy system Ni-Ti-Zr-(Si,Sn) were developed through systematic alloy design based upon the empirical rules for high glass forming alloys. Small additions of Si and/or Sn significantly improved the glass forming ability (GFA) of the alloys Ni 57 Ti 23−x Zr 20 (Si,Sn) x leading to a Ni-based bulk amorphous alloy. The amorphous ribbons of the alloys Ni 57 Ti 23−x Zr 20 (Si,Sn) x exhibited very high glass transition temperatures (T g > 823 K), crystallization temperatures (T x > 883 K), and large undercooled liquid regions (⌬T x > 50 K) implying the high GFA of the alloys. Fully amorphous rods with the diameter of up to 2 mm can be fabricated by a copper mold casting method. Development of the new Ni-based bulk amorphous alloys having high T g , T x , and ⌬T x expands the practical applications of amorphous alloys as structural materials.

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