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Retardation of cyclic indentation creep exhibited in metal alloys

Published online by Cambridge University Press:  31 January 2011

Pal Jen Wei ,
Yun Che Wang  and
Jen Fin Lin
Pal Jen Wei
Affiliation:
Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 701
Yun Che Wang
Affiliation:
Center for Micro/Nano Science and Technology and Department of Civil Engineering, National Cheng Kung University, Tainan, Taiwan 701
Jen Fin Lin*
Affiliation:
Center for Micro/Nano Science and Technology and Institute of Nanotechnology and Microsystems Engineering, National Cheng Kung University, Tainan, Taiwan 701
*
a)Address all correspondence to this author. e-mail: jflin@mail.ncku.edu.tw
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Abstract

Depth penetration per cycle and its retardation exhibited in specimens of 6061 Al were studied. By holding the maximum load reached during loading prior to cyclic oscillating, the creep could be effectively attenuated from the cyclic indentation. Constant depth penetration of sub-nanometers per cycle was found. The interrupt segments with different amplitudes (over- and underloading) or frequencies (frequency increasing and decreasing), but with same mean load, induced immediate retardations of cyclic indentation. As the interrupt segments have more than 10 cycles, the retardation is enhanced with the increase of cycle number. Accumulation of strain hardening due to stress concentration under the indenter tip is proposed to be the mechanism by which interrupt oscillation retards subsequent cyclic indentation.

Keywords

MetalNano-indentationNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 10 , October 2008 , pp. 2650 - 2656
Copyright
Copyright © Materials Research Society 2008

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References

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