Physical mechanism of internal friction behavior of β-type bulk metallic glass composites

Abstract Phase metastability of in-situ formed β-Zr/Ti plays a vital role on mechanical properties of Zr/Ti-based bulk metallic glass composites (β-type BMGCs). In the current study, internal friction behaviors of Ti 50.3 Zr 33.9 Cu 4.6 Ni 2.1 Be 9.1 BMGC containing metastable β-Ti and Ti 50.3 Zr 27.9 Cu 4.6 Ni 2.1 Be 9.1 Mo 6 BMGC containing stable β-Ti were investigated by mechanical spectroscopy. Prior to the glass transition temperature T g , Ti 50.3 Zr 33.9 Cu 4.6 Ni 2.1 Be 9.1 BMGC exhibits pronounced internal friction ascribed to the precipitation of ω-Ti in the metastable β-Ti phase. The current investigation not only reveals the fundamental mechanism of the internal friction process of BMGCs, but also provides an effective method to characterize the metastability of β phases in β-type BMGCs.