New Ti-Based Bulk Glassy Alloys with High Glass-Forming Ability and Superior Mechanical Properties

Abstract

Ti-based glassy alloy rods with diameters up to 5 mm were prepared for Ti_41.5Zr_2.5Hf₅Cu_42.5Ni_7.5Si₁ in a multi-component system of (Ti, Zr, Hf)-(Cu, Ni)-Si by conventional copper mold casting. The new mutli-component glassy alloy exhibits moderate thermal stability with a supercooled liquid region (ΔT_x) above 50 K. The glass transition temperature (T_g), crystallization temperature (T_x), melting temperature (T_x), liquidus temperature (T_l), and the reduced glass transition temperature (T_g/T_l) 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 multi-component alloy is discussed on the basis of knowledge available for bulk glass formation.