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Surface-effect territory in small volume creep deformation

Published online by Cambridge University Press:  31 January 2011

Fei Wang ,
Ping Huang  and
Tianjian Lu
Fei Wang*
Affiliation:
MOE Key Laboratory for Strength and Vibration, School of Aerospace, Xian Jiaotong University, Xi’an 710049, People's Republic of China
Ping Huang*
Affiliation:
State-Key Laboratory for Mechanical Behavior of Material, Xi’an Jiaotong University, Xi’an 710049, People's Republic of China
Tianjian Lu
Affiliation:
MOE Key Laboratory for Strength and Vibration, School of Aerospace, Xian Jiaotong University, Xi’an 710049, People's Republic of China
*
Address all correspondence to these authors.
a) e-mail: [email protected]
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Abstract

It is yet unclear how far surface effects can dominate small volume creep deformation in the surface layer of a metallic solid. We report experimental results of the apparent activation volume of single, ultrafine-grained, and nanocrystalline Cu over a range of nanoscale displacements. The dependence of the apparent activation volume on the depth and grain size was determined using nanoindentation creep tests. The surface-affected deformation regimen, within which interfacial diffusion between the nanoindenter tip and the sample totally dominates the creep behavior, was quantitatively determined to be below ∼12 nm. As the initial creep depth is increased, the dominant mechanism is shifted from interfacial diffusion to grain-boundary diffusion as the contribution of the surface effects gradually vanishes when the indenter penetrates deeper into the sample (i.e., further away from the external surface).

Keywords

DiffusionGrain sizeNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 11 , November 2009 , pp. 3277 - 3285
Copyright
Copyright © Materials Research Society 2009

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