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Rate-dependent serrated flow and plastic deformation in Ti45Zr16Be20Cu10Ni9 bulk amorphous alloy during nanoindentation

机译:Ti45Zr16Be20Cu10Ni9块体非晶合金纳米压痕过程中与速率有关的锯齿状流和塑性变形

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摘要

The plastic deformation of Ti45Zr16Be20Cu10Ni9 bulk metallic glass has been investigated by nanoindentation performed with loads ranging from 10 to 200 mN in a wide range of loading rates. The plastic flow in the alloy exhibited conspicuous serrations at low loading rates. The serrations, however, became less prominent as the rate of indentation increased. Atomic force microscopy showed a significant pile-up of materials around the indents, indicating that a highly localized plastic deformation occurred under nanoindentation. The possible mechanism governing the plastic deformation in bulk metallic glass specimens is tentatively discussed in terms of strain-induced free volume.
机译:通过纳米压痕研究了Ti45Zr16Be20Cu10Ni9块状金属玻璃的塑性变形,该压痕的载荷范围为10至200 mN。在低加载速率下,合金中的塑性流呈现出明显的锯齿。但是,随着压痕率的增加,锯齿变得不那么突出。原子力显微镜显示凹痕周围有大量材料堆积,表明在纳米压痕下发生了高度局部的塑性变形。根据应变引起的自由体积,初步讨论了控制大块金属玻璃试样塑性变形的可能机理。

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