Fig. 3.

Scanning electron micrographs of the fracture surfaces from fractured specimens associated with equilibrium states of Zr₃₅Ti₃₀Cu_8.25Be_26.75 metallic glass at various relaxation temperatures T_R: (A) 533, (B) 553, (C) 573, (D) 593, and (E) 613 K. The precrack surfaces in the fractographs are aligned and designated by dotted lines. The extent of the rough zone width L_rough in each fractograph is also designated by a dotted line. (F) Fracture toughness K_IC vs. rough zone width L_rough for the conditions in A–E. The solid line is a linear fit through the data.