Effects of additional Hf on the Thermal stability and mechanical properties of Cu-Zr-Ag bulk glassy alloys

Abstract

The thermal stability, crystallization behavior and mechanical properties of the Cu45Zr45-xHfxAg10 (x = 0 to 45 at%) glassy alloys have been investigated. The glass transition temperature (Tg), crystallization temperature (Tg), liquidas temperature (T1) and the supercooled liquid region ΔT x (= Tx - Tg) increase with increasing Hf content. The reduced glass transition temperature (Tg/T1) values are in the range from 0.54 to 0.59. The Vicker's hardness (H v), Young's modulus (E) and compressive fracture strength (σc,f) of the Cu45Zr45-xHf xAg10 (x = 0 to 25 at%) bulk glassy alloys increase linearly with increasing Hf content and reach the maximum values of 554, 123 GPa and 2020 MPa, respectively, for Cu45Zr20Hf 25Ag10 alloy. A different crystallization behavior is observed for Cu45Zr45Ag10 and Cu 45Hf45Ag10 glassy alloys. © 2006 The Japan Institute of Metals.