Abstract
Plastic deformation behaviour ofZr52.5Al10Ni10Cu15Be12.5 andMg65Cu25Gd10 bulk metallic glasses (BMGs) isstudied by using the depth-sensing nanoindentation andmicroindentation. The subsurface plastic deformation zone of the BMGsis investigated using the bonded interface technique. Both the BMGsexhibit the serrated flow depending on the loading rate in the loadingprocess of indentation. Slow indentation rates promote more conspicuousserrations, and rapid indentations suppress the serrated flow. Mg-basedBMG shows a much higher critical loading rate for the disappearance ofthe serration than that in Zr-based BMG. The significant difference inthe shear band pattern in the subsurface plastic deformation zone isresponsible for the different deformation behaviour between the twoBMGs. Increase of the loading rate can lead to the increase of thedensity of shear bands. However, there is no distinct change in thecharacter of shear bands at the loading rate of as high as 1000 nm/s.
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