Rate-dependent inhomogeneous-to-homogeneous transition of plastic flows during nanoindentation of bulk metallic glasses: Fact or artifact?
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- Rate-dependent inhomogeneous-to-homogeneous transition of plastic flows during nanoindentation of bulk metallic glasses: Fact or artifact?
- Jang, Jae-Il; Yoo, Byung-Gil; Kim, Ju-Young
- INDUCED PHASE-TRANSFORMATIONS; INSTRUMENTED INDENTATION; SERRATED FLOW; DEFORMATION; BEHAVIOR
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.90, no.21, pp.1 - 3
- There has been considerable controversy over the "apparent" rate-dependent transition from inhomogeneous-to-homogeneous flow during nanoindentation of bulk metallic glasses (BMGs) at room temperature: whether it arises from the existence of homogeneous-flow regime in BMG deformation map or is an artifact due to the instrumental blurring at high rates. To provide a clue to address this dispute, the authors performed nanoindentation experiments on a Zr-based BMG with two geometrically self-similar indenters. The results are discussed in terms of the discrete plasticity ratio, which is a useful parameter in analyzing the contribution of inhomogeneous plasticity to the total plastic deformation.
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