Design and fabrication of new Ti-based ternary metallic glasses based on effective atomic radius in the Ti solid solution calculated by ab-initio calculation

摘要

New Ti-based ternary metallic glasses were designed and fabricated. A new parameter called effective atomic radius in the Ti solid solution from ab-initio calculation was used to design of the Ti-based metallic glasses. From the effective atomic radius, Ti-Zr-Mn, Ti-Zr-Fe and Ti-Zr-Co systems can be considered as a new Ti-based ternary metallic glass. And the reported scheme based on the concept of binary eutectic clusters is applied to predict alloy composition which shows glass transition. We prepared the Ti_(42)Zr_(22)Mn_(36), Ti_(43)Zr_(29)Fe_(28) and Ti_(44)Zr_(30)Co_(26) alloy sheets by a single-roller method. It showed that sharp diffraction peak corresponding to crystalline phases could be observed in the XRD spectra of Ti_(42)Zr_(22)Mn_(36) and Ti_(43)Zr_(29)Fe_(28). While for alloy with Ti_(44)Zr_(30)Co_(26) no sharp diffraction peak could be found except broad diffraction halos. This result suggests that a critical eutectic temperature in the phase equilibrium for forming glass phase is around 1000°C.