Ni-based Bulk Metallic Glass Development And Performance

Bulk Metallic Glasses (BMGs) have been drawing increasing attention in recent years due to their scientific and engineering significance. A great deal of effort in this area has been devoted to developing BMGs in different alloy systems.In this paper, the synthesis of new Ni-based metallic glass is introduced. DSC, XRD and SEM are used in the research of Ni-Nb, Ni-Nb-Zr, Ni-Nb-Zr-Co and Ni-Nb-Zr-Co-Sn alloy systems. The thermal stability and glass transition of these alloy systems are also investigated.The Ni_60.25Nb_39.75 BMG with excellent thermal stability, high hardness and fracture strength with high corrosion resistance was synthesized. The effect of the addition of Ti, Co and Zr in Ni-Nb binary system is investigated. The best glass former in Ni-based ternary system is Ni₆₂Nb₃₃Zr₅. The best glass forming alloys with critical diameter up to 3 mm were discovered using a strategy for catching the best glass-forming alloys based on relative GFA of alloys. The Ni₆₂Nb₃₃Zr₅ alloy exhibits glass transition temperature Tg of 877 K, supercooled liquid regionΔTx of 40K, compressive strength of about 3GPa, plastic strain of about 1%. Based on the best glass former Ni₆₂Nb₃₃Zr₅, the effect of the forth element on GFA in Ni-Nb-Zr-X (X=Ti, Ta, Fe, Cu, Co, V, Y, Mo, Sn, Al, Si) BMG system has been investigated. The best GFA is found to be 3.5 mm rod for the Ni₅₇Nb₃₃Zr₅Co₅ BMG alloy. This alloy exhibits high T_g of 866 K, supercooled liquid regionΔT_x of 45 K, compressive fracture strength of 2.9 GPa, 1 % compressive plasticity, and excellent corrosion resistance as compared to stainless steel. In addition, Ni₅₇Co₅(Nb_33/38Zr_5/38)_38-xSn_x (x= 2, 3, 5 at.%) alloys with large supercooled liquid region up to 85 K is obtained. The combination of high thermal stability, high strength with compressive plasticity and excellent corrosion resistance enables these alloys to have potential industrial applications.