Prediction and fabrication of Ti–Zr–Co ternary metallic glasses based on effective atomic radius in Ti solid solution from first-principles calculations

• New Ti-based metallic glasses were predicted and fabricated in the ternary component alloy system Ti–Zr–Co.
• Constituent elements were selected by a new parameter called the effective atomic radius.
• The new parameter is the basis of the first-principles calculations for 2.78 at.% hcp Ti alloys.
• The greatest value of the super-cooled region ⊿Tx was 34 K for Ti48Zr32Co20.

New Ti-based metallic glasses were designed and fabricated in the ternary component alloy system Ti–Zr–Co. The constituent elements of the alloy system were selected based on three empirical rules proposed by Inoue, Turnbull, Senkov and Miracle, and by a new parameter called the effective atomic radius, which is based on the first-principles calculations for 2.78 at.% hcp Ti alloys. The reported scheme based on the concept of binary eutectic clusters was applied to predict the alloy composition that shows a glass transition, Ti44Zr30Co26. We prepared Ti44Zr30 + xCo26 − x, Ti46Zr28 + xCo26 − x, and Ti48Zr26 + xCo26 − x (x = 0, 4, 6, 8) alloy sheets using a single roller method. The new Ti-based ternary metallic glasses exhibited vitrification for many compositions around the predicted composition of Ti44Zr30Co26. The greatest value of the super-cooled region ⊿Tx was 34 K for Ti48Zr32Co20.