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Influence of external and internal length scale on the flow stress of copper

  • Daniel Kiener , Martin Rester , Stefan Scheriau , Bo Yang , Reinhard Pippan and Gerhard Dehm
Published/Copyright: May 23, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 98 Issue 11

Abstract

The flow stress of bulk specimens is known to depend on the microstructure. With a reduction of specimen dimensions into the micrometer and nanometer regime, specimen size-effects also influence the mechanical properties. We characterized the size-dependent flow stress of copper over more than three orders of magnitude, starting from several tens of micrometers down to a few tens of nanometers. For this purpose nanoindentation, micro-compression, and tensile testing experiments were performed. Additionally, different grain sizes were generated by severe plastic deformation. The observed increase in flow stress with reduced critical dimension is discussed with respect to the different stress states and microstructures present in the reported experiments. The mechanism controlling deformation changes from dislocation pile-up for critical dimensions > 1 μm via a transition regime (1 μm > critical dimensions > 100 nm) to dislocation nucleation for critical dimensions < 100 nm.

Keywords: Size-effect; Nanoindendation; Micro-compression; Fiber tensile testing; Severe plastic deformation
* Correspondence address, DI Daniel Kiener, Materials Center Leoben, Forschungs GmbH, Roseggerstr. 12, A-8700 Leoben, Austria, Tel.: +43 3842 804 112, Fax: +43 3842 804 116, E-mail:

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Received: 2007-4-5
Accepted: 2007-7-12
Published Online: 2013-05-23
Published in Print: 2007-11-01

© 2007, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101578
Keywords for this article
Size-effect; Nanoindendation; Micro-compression; Fiber tensile testing; Severe plastic deformation

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Professor Dr. phil. Dr. techn. e. h. Hellmut F. Fischmeister
  5. Basic
  6. Compressive deformation of lamellar microstructures – a short review
  7. Influence of external and internal length scale on the flow stress of copper
  8. Spinodal decomposition of cubic Ti1−xAlxN: Comparison between experiments and modeling
  9. Combined ab-initio and N-K, Ti-L2,3, V-L2,3 electron energy-loss near edge structure studies for TiN and VN films
  10. Gold-enhanced oxidation of silicon nanowires
  11. Numerical determination of parameterised failure curves for ductile structural materials
  12. Relaxation of semiconductor nanostructures using molecular dynamics with analytic bond order potentials*
  13. Examination of phase transformations in the system Fe–N–C by means of nitrocarburising reactions and secondary annealing experiments; the α + ∊ two-phase equilibrium
  14. Applied
  15. On the evolution of secondary hardening carbides in a high-speed steel characterised by APFIM and SANS
  16. Silicon nitride tools for hot rolling of high-alloyed steel and superalloy wires – load analysis and first practical tests
  17. Development of the unloading stiffness during cyclic plastic deformation of a high-strength aluminium alloy in different tempers
  18. Enhanced thermal stability of a cobalt–boron carbide nanocomposite by ion-implantation
  19. Experimental studies and thermodynamic simulation of phase transformations in high Nb containing γ-TiAl based alloys
  20. Kinetics of nanoscale structure development during Mg-vapour reduction of tantalum oxide
  21. On the interaction of ductile damage and materials softening of a Ni-base alloy during hot deformation
  22. Adhesive contact between flat punches with finite edge radius and an elastic half-space
  23. Notifications
  24. DGM News
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