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Time-dependent incipient plasticity in Ni3Al as observed in nanoindentation

Published online by Cambridge University Press:  03 March 2011

P.C. Wo ,
L. Zuo  and
A.H.W. Ngan
P.C. Wo
Affiliation:
Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, People's Republic of China
L. Zuo
Affiliation:
Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, People's Republic of China
A.H.W. Ngan*
Affiliation:
Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, People's Republic of China
*
a) Address all correspondence to this author. e-mail: hwngan@hku.hk
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Abstract

The time-dependent characteristics of incipient plasticity in Ni3Al during nanoindentation in the subcritical load regime were investigated statistically. The waiting time for incipient plasticity to occur at constant load was found to follow a Poisson-like distribution, with the peak shifting toward zero holding time as the load increased and eventually becoming an exponential distribution when the load was close to a critical value. The observed distribution of the strain burst waiting time at loads smaller than the critical value was inconsistent with the picture in which dislocations nucleated homogeneously out of the perfect crystal. The kinetics for the occurrence of strain burst in this case is thought to be governed by the accumulative growth of nucleation precursors.

Keywords

DefectsMechanical propertiesNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 2 , February 2005 , pp. 489 - 495
Copyright
Copyright © Materials Research Society 2005

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References

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