Abstract

New Ti-based bulk glassy alloys were synthesized in a multi-component alloy system of Ti-Cu-Ni-AI-Zr-Si-B. In a wide composition range of Ti > 50 at %, single-phase glass rods with diameters up to 2.5 mm were prepared using a conventional copper-mold casting method. The new Ti-hascd glassy alloys show compressive strength above 1900 MPa. The plastic (serrated) strain under compression is lager than 0.01. The new Ti-hased glass phase exhihits relatively high thermal stability with a large supercooled liquid region (ΔT x ) above 50 K. These glassy alloys. however, exhibit complex crystallization behavior characterized by multiple exothermic-reaction peaks on their differential scanning calorimeter (DSC) curves. The glass-forming ability of this complex system is discussed on the basis of knowledge available for bulk glass formation.

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