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Influence of size effect on microstructural changes in cyclically deformed polycrystalline nickel

  • Ellen Thiele EMAIL logo , Carl Holste and Robert Klemm
Published/Copyright: December 7, 2021
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 93 Issue 7

Abstract

Scanning and transmission electron microscopy investigations and X-ray diffraction measurements were performed on cyclically deformed nickel samples showing average grain sizes D between 500 nm and 5 μm and containing different initial dislocation structures. The results are discussed in comparison with main microstructure features observed in fatigued nickel with D = 30 μm and D = 250 μm. A lower threshold value DTH ≈ 1 μm was found for the development of typical fatigue-induced dislocation patterns (FIDPs). The spacing dPR between dislocation-dense regions in the FIDPs is nearly independent of D down to DTH and depends only weakly on the strain amplitude εpa (dPR ≈ 500 nm at εpa = 2⨯ 10 –3). While for D ≥ 3 μm no D dependence on the cyclic stress–strain curves could be observed, at D < 3 μm the stress level of the cyclic stress – strain curves seems to follow a Hall-Petch relation.

Abstract

Es wurden raster- und transmissionselektronenmikroskopische Untersuchungen sowie röntgendiffraktometrische Messungen an zyklisch verformten Nickel-Proben durchgeführt, die mittlere Korngrößen D zwischen 500 nm bis 5 μm und im Ausgangszustand unterschiedliche Versetzungsstrukturen aufwiesen. Die Ergebnisse werden diskutiert im Vergleich mit Merkmalen der Mikrostruktur ermüdeter Nickel-Vielkristalle mit D = 30 μm und D = 250 μm. Für die Herausbildung ermüdungsinduzierter Versetzungsstrukturen (FIDP) wurde ein unterer Grenzwert DTH ≈ 1 μm gefunden. Der Abstand dPR zwischen versetzungsreichen Gebieten in den FIDP ist herunter bis zu DTH nahezu unabhängig von D und hängt nur schwach von der Dehnungsamplitude εpa ab (dPR ≈ 500 nm für εpa = 2⨯ 10 –3). Während für D ≥ 3 μm keine D-Abhängigkeit der zyklischen Spannung –Dehnung-Kurven beobachtet wurde, scheint das Spannungsniveau der zyklischen Spannung –Dehnung-Kurven für D < 3 μm einer Hall-Petch-Beziehung zu folgen.

Keywords: Polycrystalline nickel; Cyclic deformation behaviour; Grain size; Dislocation structures; Internal stresses

Dedicated to Professor Dr. Haël Mughrabi on the occasion of his 65th birthday

The authors want to thank V. I. Kopylov (Belorussian Academy of Sciences, Minsk, Belorussia) and R.Z. Valiev (Ufa State Aviation Technical University, Russia) for providing the ECAP materials.

Dr. E. Thiele Institut für Physikalische Metallkunde Technische Universität Dresden D-01062 Dresden, Germany Tel.: +49 351 463 36684 Fax: +49 351 463 37799

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Received: 2002-02-19
Published Online: 2021-12-07
Published in Print: 2021-12-07

© 2002 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles/Aufsätze
  5. A model for the work hardening of WC–Co “hard metals”
  6. On the dispersion strengthening mechanisms in ODS materials
  7. Effect of hydrogen on the mechanical properties of the β titanium alloy Timetal® 21S
  8. Cyclic deformation behaviour of (α + β) titanium alloys under complex mechanical and physiological loading conditions
  9. Assessment of the influence of interdendritic shrinkage cavities on the thermo-mechanical fatigue behaviour of the nickel-base superalloy MAR-M247LC
  10. Effects of static strain aging on residual stress stability and alternating bending strength of shot peened AISI 4140
  11. On the possibilities to enhance the fatigue properties of ultrafine-grained metals
  12. New method of determining stress relaxation behavior in creep machines by controlled unloading
  13. Creep of binary Ni-rich NiTi shape memory alloys and the influence of pre-creep on martensitic transformations
  14. Interaction of high-cycle fatigue with high-temperature creep in superalloy single crystals
  15. A unified description of creep in pure and dispersion-strengthened copper
  16. A new interpretation of flow-stress measurements of high-purity NiAl below room temperature
  17. A mesoscopic plasticity model accounting for spatial fluctuations of plastic strains, internal stresses and dislocation densities
  18. Behavior of X-ray peak widths in the Wilkens model of a restrictedly random distribution of dislocations
  19. Dislocation structure and crystallite size distribution in hexagonal nanomaterials from X-ray peak profile analysis
  20. Werden gewichtsoptimiert konstruierte Bauteile durch die Verwendung von Leichtmetallen wirklich leichter?*)
  21. Strain-induced martensite formation in metastable austenitic steels with varying carbon content
  22. Isothermal bainitic transformation in low alloy steels: factors limiting prediction of the resulting material’s properties
  23. Fatigue damage evolution in a particulate-reinforced metal matrix composite determined by acoustic emission and compliance method
  24. Microstructure and modification mechanisms of Si phase in as-thixoformed alloy A356
  25. Influence of size effect on microstructural changes in cyclically deformed polycrystalline nickel
  26. Self-diffusion of 71Ge and 31Si in Si –Ge alloys
  27. On localised corrosive attack, stress corrosion cracking and corrosion fatigue effects in a hardmetal cutting-tool material
  28. The internal stress during growth of SiC single crystals
  29. Notifications/Mitteilungen
  30. Personal/Personelles
  31. Books/Bücher
  32. DGM Conferences/Training
https://doi.org/10.3139/ijmr-2002-0123
Keywords for this article
Polycrystalline nickel; Cyclic deformation behaviour; Grain size; Dislocation structures; Internal stresses

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles/Aufsätze
  5. A model for the work hardening of WC–Co “hard metals”
  6. On the dispersion strengthening mechanisms in ODS materials
  7. Effect of hydrogen on the mechanical properties of the β titanium alloy Timetal® 21S
  8. Cyclic deformation behaviour of (α + β) titanium alloys under complex mechanical and physiological loading conditions
  9. Assessment of the influence of interdendritic shrinkage cavities on the thermo-mechanical fatigue behaviour of the nickel-base superalloy MAR-M247LC
  10. Effects of static strain aging on residual stress stability and alternating bending strength of shot peened AISI 4140
  11. On the possibilities to enhance the fatigue properties of ultrafine-grained metals
  12. New method of determining stress relaxation behavior in creep machines by controlled unloading
  13. Creep of binary Ni-rich NiTi shape memory alloys and the influence of pre-creep on martensitic transformations
  14. Interaction of high-cycle fatigue with high-temperature creep in superalloy single crystals
  15. A unified description of creep in pure and dispersion-strengthened copper
  16. A new interpretation of flow-stress measurements of high-purity NiAl below room temperature
  17. A mesoscopic plasticity model accounting for spatial fluctuations of plastic strains, internal stresses and dislocation densities
  18. Behavior of X-ray peak widths in the Wilkens model of a restrictedly random distribution of dislocations
  19. Dislocation structure and crystallite size distribution in hexagonal nanomaterials from X-ray peak profile analysis
  20. Werden gewichtsoptimiert konstruierte Bauteile durch die Verwendung von Leichtmetallen wirklich leichter?*)
  21. Strain-induced martensite formation in metastable austenitic steels with varying carbon content
  22. Isothermal bainitic transformation in low alloy steels: factors limiting prediction of the resulting material’s properties
  23. Fatigue damage evolution in a particulate-reinforced metal matrix composite determined by acoustic emission and compliance method
  24. Microstructure and modification mechanisms of Si phase in as-thixoformed alloy A356
  25. Influence of size effect on microstructural changes in cyclically deformed polycrystalline nickel
  26. Self-diffusion of 71Ge and 31Si in Si –Ge alloys
  27. On localised corrosive attack, stress corrosion cracking and corrosion fatigue effects in a hardmetal cutting-tool material
  28. The internal stress during growth of SiC single crystals
  29. Notifications/Mitteilungen
  30. Personal/Personelles
  31. Books/Bücher
  32. DGM Conferences/Training
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