New experimental insight into the mechanisms of nanoplasticity

W. Skrotzki, A. Eschke, B. Jóni, T. Ungár, L. S. Tóth, Yu Ivanisenko, L. Kurmanaeva

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The evolution of microstructure and texture of a nanocrystalline Pd-10 at.% Au alloy (initial grain size 16 nm) subjected to severe plastic deformation by high-pressure torsion (HPT) at room temperature is investigated by X-ray line profile analysis and X-ray microdiffraction, respectively. In addition, changes in the microhardness are measured and the texture is modeled. During HPT the microstructure changes: the crystallite size goes over the maximum, the dislocation density goes through a minimum and the density of stacking faults decreases at/up to a shear strain of ∼1, corresponding to a grain size of 20 nm. Starting with a random texture, typical brass-type shear components develop at a shear strain above ∼1. The microhardness with decreasing crystallite size goes over a maximum at ∼20 nm. The correlated changes in microstructure, texture and strength strongly suggest the transition from a dislocation slip to a grain boundary sliding (GBS)-dominated deformation mechanism. The unexpected brass-type texture and its deviation from the ideal position can be simulated with the Taylor model assuming dominant partial dislocation slip and a certain contribution of GBS, respectively. Taken together, the results of many techniques applied to the same material, in particular those of the texture investigations, provide a more comprehensive and consistent picture of nanoplasticity than reported before for face-centered cubic metals.

Original languageEnglish
Pages (from-to)7271-7284
Number of pages14
JournalActa Materialia
Volume61
Issue number19
DOIs
Publication statusPublished - Nov 2013

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Textures
Grain boundary sliding
Shear strain
Brass
Crystallite size
Torsional stress
Microhardness
Microstructure
X rays
Stacking faults
Plastic deformation
Metals
Temperature
brass

Keywords

  • Deformation mechanisms
  • High-pressure torsion
  • Microstructure
  • Nanoplasticity
  • Texture

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

Cite this

Skrotzki, W., Eschke, A., Jóni, B., Ungár, T., Tóth, L. S., Ivanisenko, Y., & Kurmanaeva, L. (2013). New experimental insight into the mechanisms of nanoplasticity. Acta Materialia, 61(19), 7271-7284. https://doi.org/10.1016/j.actamat.2013.08.032

New experimental insight into the mechanisms of nanoplasticity. / Skrotzki, W.; Eschke, A.; Jóni, B.; Ungár, T.; Tóth, L. S.; Ivanisenko, Yu; Kurmanaeva, L.

In: Acta Materialia, Vol. 61, No. 19, 11.2013, p. 7271-7284.

Research output: Contribution to journalArticle

Skrotzki, W, Eschke, A, Jóni, B, Ungár, T, Tóth, LS, Ivanisenko, Y & Kurmanaeva, L 2013, 'New experimental insight into the mechanisms of nanoplasticity', Acta Materialia, vol. 61, no. 19, pp. 7271-7284. https://doi.org/10.1016/j.actamat.2013.08.032
Skrotzki W, Eschke A, Jóni B, Ungár T, Tóth LS, Ivanisenko Y et al. New experimental insight into the mechanisms of nanoplasticity. Acta Materialia. 2013 Nov;61(19):7271-7284. https://doi.org/10.1016/j.actamat.2013.08.032
Skrotzki, W. ; Eschke, A. ; Jóni, B. ; Ungár, T. ; Tóth, L. S. ; Ivanisenko, Yu ; Kurmanaeva, L. / New experimental insight into the mechanisms of nanoplasticity. In: Acta Materialia. 2013 ; Vol. 61, No. 19. pp. 7271-7284.
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