Ti-based amorphous alloys with a large supercooled liquid region

A new amorphous alloy system of Ti-Cu-Ni-B-Sn-Si with high thermal stability of supercooled liquid was found. The temperature interval of the supercooled liquid region before crystallization was above 70 K. The glass transition temperature (Tg) and the reduced glass transition temperature (Tg/Tm) of the Ti50Cu20Ni24B1Si2Sn3 alloy are 726 K and 0.59, respectively. The high thermal stability of the supercooled liquid as well as the high Tg/Tm leads to the production of bulk amorphous alloy with a diameter up to 1 mm by copper mold casting. The Vickers hardness, Young’s modulus and tensile fracture strength of the 1 mm diameter bulk amorphous alloy are 620, 110 GPa and 2100 MPa, respectively. The fracture surface exhibits a vein-like morphology, typical for many ductile amorphous alloys.