New ti-based bulk glassy alloys with high glass-forming ability and superior mechanical properties

Ti-based glassy alloy rods with diameters up to 5 mm were prepared for Ti-41.5Zr2.5Hf5CU42.5Ni7.5Si1 in a mutli-component system of (Ti, Zr, Hf)-(Cu, Ni)-Si by conventional copper mold casting. The new multi-component glassy alloy exhibits moderate thermal stability with a supercooled liquid region (AT.) above 50 K. The glass transition temperature (T.), crystallization temperature (T,), melting temperature (T,), liquidus temperature (T-I), and the reduced glass transition temperature (T-g/T-I) are 680 K, 730 K, 1143 K, 1199 K and 0.57, respectively. The cast glassy alloy exhibits compressive strength of 2080 MPa, tensile strength of 2040 MPa and Young's modulus of 100 GPa. The reason for the high glass-forming ability (GFA) of the Ti-based in multi-component alloy is discussed on the basis of knowledge available for bulk glass formation.