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Multiaxial deformation characteristic of a Zr-based bulk metallic glass: Variations of the plastic constraint factor underneath a spherical indenter

Published online by Cambridge University Press:  31 January 2011

Yun-Hee Lee ,
Ju-Young Kim ,
Un-Bong Baek  and
Seung-Hoon Nahm
Yun-Hee Lee*
Affiliation:
Division of Metrology for Quality Life, Korea Research Institute of Standards and Science, Daejeon 305-340, Korea
Ju-Young Kim
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Un-Bong Baek
Affiliation:
Division of Metrology for Quality Life, Korea Research Institute of Standards and Science, Daejeon 305-340, Korea
Seung-Hoon Nahm
Affiliation:
Division of Metrology for Quality Life, Korea Research Institute of Standards and Science, Daejeon 305-340, Korea
*
a)Address all correspondence to this author. e-mail: uni44@kriss.re.kr
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Abstract

Multiaxial deformation of Zr55Al10Ni5Cu30 metallic glass was investigated by instrumented indentation tests with a spherical indenter. Contrary to the elastic–rigid-plastic behavior of bulk metallic glasses (BMGs), indentation pressure showed a significant increase with increasing indentation strain, and it was ascribed to a rapid transition of the plastic constraint factor (PCF). However, it was impossible to measure the PCF values from the indentation pressures in the Zr-based BMG because information on uniaxial flow stress was insufficient due to the limited flow strain of 2.2%. Here we developed a PCF assessment method using a relative residual depth hf/hmax, which was experimentally confirmed by adopting it to spherical indentations of a steel sample having well-known flow properties. Flow properties of the BMG were calculated using the new PCF assessment method, and the effects of the materials pileup and low strain indentations on PCF and flow properties were discussed.

Keywords

AmorphousStress/strain relationshipHardness
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 10 , October 2007 , pp. 2895 - 2901
Copyright
Copyright © Materials Research Society 2007

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References

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