Ti-based amorphous alloys with a large supercooled liquid region

A new amorphous alloy system of Ti-eu-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 R. The glass transition temperature (T-g) and the reduced glass transition temperature (T-g/T-m) of the Ti50Cu20Ni24B1Si2Sn3 alloy are 726 K and 0.59. respectively. The high thermal stability of the supercooled liquid as well as the high T-g/T-m 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. (C) 2001 Elsevier Science B.V. All rights reserved.