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Surface-effect territory in small volume creep deformation

Published online by Cambridge University Press:  31 January 2011

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.
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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).

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Articles
Copyright
Copyright © Materials Research Society 2009

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