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Rate Dependence of Serrated Flow During Nanoindentation of a Bulk Metallic Glass

Published online by Cambridge University Press:  31 January 2011

C. A. Schuh ,
T. G. Nieh  and
Y. Kawamura
C. A. Schuh
Affiliation:
Materials Science and Technology Division, Lawrence Livermore National Laboratory, Livermore, California 94550
T. G. Nieh
Affiliation:
Materials Science and Technology Division, Lawrence Livermore National Laboratory, Livermore, California 94550
Y. Kawamura
Affiliation:
Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Kumamoto University, Kumamoto, 860, Japan
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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.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 7 , July 2002 , pp. 1651 - 1654
Copyright
Copyright © Materials Research Society 2002

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