Letter to the Editor Effect of strain rates on the fracture morphologies of Zr-based bulk metallic glasses

The effect of strain rates from 1 · 10 � 4 s � 1 to 2 · 10 3 s � 1 on tensile fracture morphologies of Zr52:5Al10Ni10Cu15Be12:5, Zr65Al10Ni10Cu15, and Zr52:5Al10Ni14:6Cu17:9Ti5 bulk amorphous alloys was investigated by scanning electron microscopy. The results show that the tensile fracture morphologies of three compositions of bulk amorphous alloys are dependent on strain rate. At low strain rates, the tensile fracture surface morphology of Zr-based bulk metallic glasses presents cleavage veins. However, the morphology will become microvoid-coalescence dimples when the strain rate is high enough. � 2003 Elsevier B.V. All rights reserved.