Ni-based bulk metallic glass formation in the Ni–Nb–Sn and Ni–Nb–Sn–X (X=B,Fe,Cu) alloy systems

Choi-Yim, Haein; Xu, Donghua; Johnson, William L.
February 2003
Applied Physics Letters;2/17/2003, Vol. 82 Issue 7, p1030
Academic Journal
Refractory Ni-based bulk metallic glasses are formed in the three-component Ni-Nb-Sn system near a ternary eutectic composition located within the three-phase field bounded by the three intermetallics Ni[sub 3]Nb, Ni[sub 6]Nb[sub 7] (μ-phase), and Ni[sub 2]NbSn (BiF[sub 3]-type). Bulk amorphous alloys of composition Ni[sub 60]Nb[sub 40-x]Sn[sub x] with 3 < x < 9 were prepared by injection-casting the molten alloys into copper models. X-ray diffraction and differential scanning calorimetry studies show the cast strips to be fully amorphous up to thicknesses from 0.5 to 3 mm as x is varied. Maximum glass-forming ability (GFA) observed when x is between 6 and 7. These refractory bulk amorphous alloys exhibit high glass transition temperatures 881 < T[sub g] < 895 K, a large, stable, undercooled liquid region with ΔT = T[sub x] - T[sub g], at ∼40-60 K, very high Vickers hardness (VH∼1000-1280 Kg/mm²), and estimated yield strengths in the range of 3 to 3.8 GPa. The effects of small quaternary additions of B and Fe on the GFA of the ternary alloys are also reported.


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