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The effect of transition metals Nb and Ta on the glass-forming ability of Ni75Si8B17 was examined. New Ni-Si-B-M (M = Nb, Ta) glassy alloys with high Ni contents above 70 at% were found to exhibit a glass transition before crystallization. The glass transition temperature (Tg) increases continuously with increasing Nb or Ta content. The supercooled liquid region ( Txð¼ TxTgÞ) and reduced glass transition temperature (Tg=Tl) are 30 K and 0.59, for (Ni0:75Si0:08B0:17)96Nb4 and 35 K and 0.61, for (Ni0:75Si0:08B0:17)96Ta4, respectively. These two glassy alloys exhibit high fracture strength and good bend ductility. The maximum fracture strength of the Ni-Si-B-Nb and Ni-Si-B-Ta alloys is 2510 and 2730 MPa, respectively. All the samples can be folded through an angle of 180 degrees without fracture. The use of the glassy-type (Ni0:75Si0:08B0:17)96Ta4 alloy enabled us to form a glassy alloy rod with a diameter of 0.5 mm by the copper mold casting method. The combination of the new alloy composition, high glass-forming ability and good mechanical properties of the Ni-based glassy alloys indicates that the new bulk glassy alloy may be used as a new type of engineering material.

Glass Transition Behavior and Mechanical Properties of Ni-Si-B-Based Glassy Alloys