Crystallization behaviour in a new multicomponent Ti16.6Zr16.6Hf16.6Ni20Cu20Al10 metallic glass developed by the equiatomic substitution technique

Journal article

A new amorphous Ti16.6Zr16.6Hf16.6Ni 20Cu20Al10 alloy has been developed using the novel equiatomic substitution technique. Melt spinning Ti16.6Zr 16.6Hf16.6Ni20Cu20Al10 forms an amorphous phase with a large supercooled liquid region, ΔT = 70°C. After isothermal annealing within the supercooled liquid region for 3 h at 470°C, the amorphous alloy crystallizes to form a fine-scale distribution of 2-5 nm nanocrystals, and the supercooled liquid region increases to ΔT=108°C. Atomic-scale compositional analysis of this partially crystalline material using a three-dimensional atom probe (3DAP) is unable to detect any compositional difference between the nanocrystals and the remaining amorphous phase. After annealing for 1 hr at 620°C, the amorphous alloy crystallizes to form 20-50 nm equiaxed grains of a hexagonal-type C14 Laves phase with lattice parameters a = 5.2 Å and c = 9.0 Å. 3DAP analysis shows that this Laves phase has a composition very close to that of the initial amorphous phase, suggesting that the alloy crystallizes via a polymorphic rather than a primary crystallization mechanism, despite the complexity of the alloy composition.

Authors: Kim, K; Zhang, Y; Warren, P; Cantor, B

• Publication status: Published
• Journal: PHILOSOPHICAL MAGAZINE
• Volume: 83
• Issue: 20
• Pages: 2371-2381
• Publication date: 2003-07-11
• DOI: 10.1080/0141861031000113343
• EISSN: 1478-6443
• ISSN: 1478-6443
• Language: English