Preparation of Ni-based bulk metallic glasses with high corrosion resistance

• Ni77 − x − yMoxCryNb3P14B6 (x = 5–9, y = 0–5) BMGs were prepared by fluxing treatment and J-quenching technique.
• The Dmax for fully glass formation reaches to the maximum of 1.5 mm for Ni67Mo5Cr5Nb3P14B6.
• The present Ni-based BMGs exhibit the excellent corrosion resistance with a Icorr of ~ 10− 6 A/cm2 and a Rcorr < 10− 3 mm/year in 1 M HCl and 1 M NaCl solutions.
• The present Ni-based BMGs exhibit the strength of 2.5–3.4 GPa, but almost no compressive plasticity.

Bulk Ni77 − x − yMoxCryNb3P14B6 (x = 7 y = 0; x = 8 y = 0; x = 9 y = 0; x = 5 y = 3; x = 5 y = 5; x = 5 y = 8; x = 8 y = 3; x = 8 y = 5, all in at.%) glassy alloy rods with the diameters of 1.0–1.5 mm were synthesized by combining fluxing technique and J-quenching technique. The effects of Mo and Cr substitution for Ni on the glass forming ability (GFA), thermal stability, mechanical properties and corrosion properties of the present Ni-based bulk metallic glasses (BMGs) had been studied systematically. It is found that the substitution of an appropriate amount of Cr and Mo for Ni can enhance the GFA of the present Ni-based alloys, while excessive substitution will lead to the degradation of the GFA. The corrosion tests show that the corrosion current density and corrosion rate of most of the present Ni-based BMGs in 1 M NaCl and 1 M HCl solutions are in the order of 10− 6 A/cm2 and 10− 2 mm/year, respectively, exhibiting very high corrosion resistance. The addition of the appropriate Mo content and the Cr content as much as possible are benefit for the enhancement of the corrosion resistance of the present Ni-based BMGs. The compressive tests show that that the present Ni-based BMGs exhibit a compressive strength of 2.5–3.4 GPa, but nearly zero compressive plasticity.