Hard metallic glass of tungsten-based alloy

Abstract

A tungsten-based ductile metallic glass with the composition W46Ru37B17 was produced by a single-roller melt-spinning procedure. The differential scanning calorimetry measurement showed a two-step crystallization with the first crystallization temperature as high as 1174 K. Young’s modulus of the glass at room temperature was estimated to be 309±20 GPa by a nanoindentation test and the Vickers hardness at room temperature was 16.8±1 GPa. These values are higher than those of any metallic glasses so far reported. High-temperature Vickers hardness test indicated that the hardness value is higher than 10 GPa up to 900 K.

Modeling hardness of polycrystalline materials and bulk metallic glasses

“…This is somehow unexpected because for BMGs there exists a universal correlation between the Yough's modulus and the Vicker's hardness as documented in Refs. [19,93,94].…”

Anelastic deformation of a Pd40Cu30Ni10P20 bulk metallic glass during nanoindentation

“…Some bulk metallic glasses ͑BMGs͒ and amorphous ribbons exhibit outstanding mechanical properties, [1][2][3][4][5] and good corrosion and wear resistance. 6 This makes them attractive as structural materials.…”

Synthesis and elastic properties of amorphous steels with high Fe content

“…For example, the BMGs based on Pr or Ce elements (with low E) have the lowest values of E among existing BMGs; while the Co-and Fe-based BMGs (for pure Co and Fe, E is larger than 200 GPa) all have high values of E and strength [15]. In fact, tungsten-based glasses [16] (For W, EZ411 GPa) have an extreme high E (Z309 GPa) and exceptionally stronger mechanical properties than any existing metallic glass. Previous work also indicated that the elastic constants of BMGs show a good correlation with the weighted average of the elastic constants of the constituent elements, i.e.…”

“…The studies are mostly focused on soft magnetic properties because of their low GFA and small sample sizes. Recently, Fe 75KxKy Cr x Mo y C 15 B 10 [5] and Fe 43 Cr 16 Mo 16 (C, B, P) 25 [6] which exhibit high corrosion resistance and high GFA were developed. These Fe-based BMGs also are called nonmagnetic bulk amorphous alloys due to the absence of magnetic properties at room or higher temperature.…”