Abstract
The plastic deformation behavior and serrated flow in seven bulk metallic glass (BMG) systems were investigated through instrumented indentation. These materials include Ce 65Al 10Ni 10Cu 10Nb 5, Mg 65Cu 25Gd 10, Pd 43Ni 10Cu 27P 20, Cu 60Zr 20Hf 10Ti 10, Pt 57.5Cu 14.7Ni 5.3P 22.5, Ni 60Nb 37Sn 3 and Fe 43Cr 16Mo 16C 15B 10 BMGs, which show a glass transition temperature ( T g) ranging from 360 to 908 K at a heating rate of 0.33 K/s. Remarkable difference in deformation behavior was found among these BMGs in the load–depth curves during nanoindentation. Prominent serrations are observed in Mg-, Pt- and Pd-based BMGs with medium T g during the loading process, whereas no distinct serrated flow was found in Ce-, Ni- and Fe-based BMGs with quite low or high T g. The subsurface plastic deformation regions after indentation were investigated using depth-sensing microindentation to characterize the shear band feature developed in various BMG systems. The size of the shear band upset is found to be larger in the alloys with lower T g. The effect of T g on the operation of shear bands and the serrated flow behavior in various BMG systems were discussed.
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