Crystallization, high temperature deformation behavior and solid-to-solid formability of a Ti-based bulk metallic glass within supercooled liquid region

• Crystallization and plastic deformation of a Ti-based BMG were investigated.
• This BMG has excellent thermal stability in terms of effective activation energies.
• Power dissipation efficiency above 0.4 without in-situ crystallization can be suggested.
• Optimum warm extrusion condition can be suggested as T = 410 °C and ε = 5 × 10−3 s−1.

Empirical information of crystallization was first deduced using differential scanning calorimeter for a monolithic Ti44.4Zr6.6(Cu0.8Ni0.15Sn0.05)49 bulk metallic glass with 2 mm in diameter, characterized by a high activation energy and short incubation time for crystallization. Through the understanding of the compressive deformation modes as a function of temperature and strain rate within supercooled liquid region, processing map was constructed based on dynamic materials model. By overlapping time-temperature transformation curve onto processing map, macroscopic formability was found to have a good correspondence with the region of iso-efficiency contours having power dissipation efficiency above 0.4 without in-situ crystallization.

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