Microstructure and mechanical evolution of Ti-based bulk metallic glass induced by deformation and isothermal annealing in supercooled liquid region

The effects of deformation and isothermal annealing in supercooled liquid region on the microstructure and room-temperature mechanical properties of the Ti33Zr30Cu9Ni5.5Be22.5 bulk metallic glass were systematically investigated. The results indicated that the thermally-deformed specimens exhibited denser structures and higher characteristic temperatures (Tg and Tx) than the annealed specimens at the corresponding temperature; however, this difference gradually decreased as the experimental temperature increased. Further, the thermally-deformed specimens exhibited higher yield and fracture strengths than the annealed specimens, whereas they exhibited similar plasticity. The deformed and annealed specimens precipitated some nanocrystals with a size of approximately 10 nm when the experimental temperature increased to 648 K, causing the rapid deterioration of their plasticity.

Automated summary

The effects of deformation and isothermal annealing in the supercooled liquid region on the microstructure and room-temperature mechanical properties of Ti33Zr30Cu9Ni5.5Be22.5 bulk metallic glass were investigated. The thermally-deformed specimens showed denser structures and higher characteristic temperatures compared to the annealed specimens, with higher yield and fracture strengths but similar plasticity. Both deformed and annealed specimens precipitated nanocrystals at around 648 K, leading to a rapid decrease in plasticity.