Abstract
The plastic deformation features of Zr- and Ti-based bulk metallic glasses (BMGs) are investigated by scratch method under different applied load and scratch velocity. The results show that the two BMG systems exhibit quite different shear band features during scratch processes. Shear band branching are found in Ti-based BMG, and the branching are more prominent at high applied load and rate during the scratch process. In contrast, the Zr-based BMG shows primary shear band dominating pattern, which becomes more straight and regular at high load and rate. Furthermore, the effect of structural relaxation on the shear band feature during scratch tests is studied. It is found that relaxation gives rise to a distinct transition from primary shear band dominating pattern to a branching and irregular pattern in the Zr-based BMG. The mechanism of change of the shear band pattern is discussed in the view of free volume theory.
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