Abstract
Plastic deformation of Pd–40Ni–20P bulk metallic glass (BMG) was investigated by instrumented nanoindentation experiments over a broad range of indentation strain rates. At low rates, the load–displacement curves during indentation exhibited numerous serrations or pop-ins, but these serrations became less prominent as the indentation rate was increased. Using the tip velocity during pop-in as a gauge of serration activity, we found that serrated flow is only significant at indentation strain rates below about 1–10/s. This result suggests a transition in plastic flow behavior at high strain rates, in agreement with prior studies of BMGs under different modes of loading.
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Schuh, C.A., Nieh, T.G. & Kawamura, Y. Rate Dependence of Serrated Flow During Nanoindentation of a Bulk Metallic Glass. Journal of Materials Research 17, 1651–1654 (2002). https://doi.org/10.1557/JMR.2002.0243
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DOI: https://doi.org/10.1557/JMR.2002.0243